• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 21
  • 6
  • 2
  • 1
  • Tagged with
  • 35
  • 22
  • 14
  • 12
  • 11
  • 10
  • 9
  • 9
  • 8
  • 8
  • 8
  • 7
  • 6
  • 6
  • 6
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Young adults' experiences of their relationships with familialy-related older people / Ursula Nagel

Nagel, Ursula January 2014 (has links)
Intergenerational relationships can be defined as interactions between members of different generations. There are two different groups of intergenerational relationships, historical and familial. The familial relationship consists of members who are familially related, while historical generations can be viewed as a cohort, or a group of people who have experienced similar historical events, because they are the same age or have lived through the same historical period. Most research in South Africa has focused on intergenerational relationships among African families. Research into these families highlights the role of grandparents as people with wisdom, life experience and the educative relationship they have with their grandchildren. Grandchildren, on the other hand, have to take care of their grandparents and respect them as older people. Members of the different generations provide social support, despite the fact that they are not familially-related. The norms that guided the interactions between these two generations provide individuals with a sense of continuity and stability. Social theories regarding intergenerational relationships are: the solidarity model, the solidarity and conflict model, and ambivalence. Current theories from the psychological perspective are: intergenerational intelligence and self-interactional group theory (SIGT). Little research has been conducted into intergenerational relationships among white familial generations in South Africa even though the phenomenon has been widely researched internationally. In order to establish the nature of the intergenerational relationship, young adults’ lived experiences of their relationships with older people was the focus of this research. This focus has been motivated by the fact that young adults and older people can benefit from effective intergenerational relationships; young adults provide a source of physical and emotional care for older people, where the older person in turn provide a source of affirmation and shared experience for young adults. This research is further motivated by the fact that it cannot be assumed that white generations in South Africa are necessarily following international trends. The study was conducted at the North-West University, at Potchefstroom in South Africa. Psychology Honours students were purposively selected to participate because of their age group as young adults, and their knowledge of human behaviour. It was thought that their description of their relational experiences would be of particular interest. Nineteen young adults (eighteen women and one man) aged 21 to 30 formed part of the study. Ethical approval for the research was obtained from North-West University. The participants gave informed consent that their participation was voluntary, and that they had been made aware that they could withdraw from the study at any time for whatever reason without any negative consequences. They were provided with the materials of the Mmogo-method®, which consist of clay, straws and colourful beads, and were invited to make a visual representation of their relationship with a person older than 60 years. When all the participants had completed their visual presentations, the researcher asked what each had made and why they had made it. An informal group discussion was conducted after each participant had told the others what they had made. During the discussion participants shared their subjective view of their experiences of their relationship with older people. The researcher employed visual data analysis and discourse analysis to analyse the data. Different guidelines were applied to ensure the trustworthiness of the research process and the findings. The results revealed that young adults experienced four types of relationships, which are presented as typologies. The two axes which describe the four types of relationships are: intimacy (physical and emotional) or distance and empathy or judgemental. The four types of intergenerational relationships that emerged from the combination of the different axes were: effective, normative-guided, ineffective, and double-bind. These findings can be used to develop programmes and interventions to promote intergenerational relationships. They also provide an opportunity for cross-cultural and international data to be compared with the four different relationship types. / MA (Clinical Psychology), North-West University, Potchefstroom Campus, 2014
12

Die maatskaplike werker se rol in die bevordering van verhoudings tussen ouers met uitdagende sosiale omstandighede en onderwysers in 'n plattelandse gemeenskap / Hannalie Aletta van der Merwe

Van der Merwe, Hannalie Aletta January 2014 (has links)
A qualitative research study was undertaken within a participatory action research design in order to identify the role of the social worker in the advancement of relationships between parents with challenging social circumstances and teachers in a rural community. By making use of visual aids, the discussion groups with parents, teachers and members of the community could be facilitated and it was during these discussion groups that they could describe their experiences with regard to parent-teacher-relationships in the specific rural community. From the data that was collected several challenging social circumstances in the home and school context were identified that can hamper parents’ involvement in school activities as well as parent-teacher-relationships. During the cooperation with the members of the community several responsibilities were attributed to social workers through which they can contribute to the advancement of relationships between parents with challenging social circumstances and teachers in the specific rural community. The responsibilities attributed to social workers include addressing the challenging social circumstances that parents and children experience, supporting parents in their parenting roles, informing parents on the importance of schooling and a vision for the future for their children, empowering parents and children with regard to their rights to education and their rights within the school context and equipping teachers to be able to handle challenging social circumstances in the community. The ways in which social workers can act as social brokers, teachers, facilitators, mediators and advocates in terms of these responsibilities are also discussed. / MSW, North-West University, Potchefstroom Campus, 2014
13

Young people's perceptions of older people before and after an ethnodrama presentation / Dunay Nortje

Nortje, Dunay January 2013 (has links)
Research has shown that we presently live in an era where birth rates are low and life expectancy is high, drawing the conclusion that older people will be part of young people’s lives for longer. Intergenerational relationships refer to the relationship between two or more generations and are crucial for growth within both generations, young and old. There are many stereotypes attached to old age, and it has been found that young people take on these stereotypes through the media and society. The aim of this study was to explore young people’s perceptions of older people before and after an ethnodrama presentation. Programme evaluation which forms part of applied qualitative research was used. The participants for the research were selected from four schools across Gauteng through convenience sampling, and their ages ranged from ten to sixteen years old. The presentation consisted of an icebreaker and the ethnodrama, which is defined as the dramatisation of researched data. The ethnodrama aimed at generating a better understanding of older people, and refuting negative perceptions associated with older people and aging. It was specifically aimed to tell a story of how older people are living in South-Africa based on previous research. The data, to determine the participants’ perceptions of older people, were collected by means of questionnaires containing open-ended questions. The data were obtained before and immediately after the presentation of the ethnodrama. Thematic analysis was used to transform the data into meaningful information. Findings in this study were not intended to generalize or prove the efficacy of the programme, but to establish how young people perceive older people and whether an ethnodrama presentation had any influence on these perceptions. The findings of the evaluation before the presentation revealed that young people have ambivalent, stereotypical or favourable perceptions of older people. The evaluation directly after the presentation showed a more nuanced description of older people, whereby younger people did not just describe them according to their identities as older people, but also described the relationship between young and old, and expressed an understanding for older people’s needs. In conclusion, the ethnodrama seemed to have an impact on younger people’s perceptions of older people, although stereotypical perceptions remained throughout the study. It is recommended that young people are encouraged to interact with older people from a young age in order to base their perceptions on first-hand accounts of experience gained through these interaction, and possibly dismiss any negative perceptions they may have. / MA (Psychology), North-West University, Potchefstroom Campus, 2014
14

Young people's perceptions of older people before and after an ethnodrama presentation / Dunay Nortje

Nortje, Dunay January 2013 (has links)
Research has shown that we presently live in an era where birth rates are low and life expectancy is high, drawing the conclusion that older people will be part of young people’s lives for longer. Intergenerational relationships refer to the relationship between two or more generations and are crucial for growth within both generations, young and old. There are many stereotypes attached to old age, and it has been found that young people take on these stereotypes through the media and society. The aim of this study was to explore young people’s perceptions of older people before and after an ethnodrama presentation. Programme evaluation which forms part of applied qualitative research was used. The participants for the research were selected from four schools across Gauteng through convenience sampling, and their ages ranged from ten to sixteen years old. The presentation consisted of an icebreaker and the ethnodrama, which is defined as the dramatisation of researched data. The ethnodrama aimed at generating a better understanding of older people, and refuting negative perceptions associated with older people and aging. It was specifically aimed to tell a story of how older people are living in South-Africa based on previous research. The data, to determine the participants’ perceptions of older people, were collected by means of questionnaires containing open-ended questions. The data were obtained before and immediately after the presentation of the ethnodrama. Thematic analysis was used to transform the data into meaningful information. Findings in this study were not intended to generalize or prove the efficacy of the programme, but to establish how young people perceive older people and whether an ethnodrama presentation had any influence on these perceptions. The findings of the evaluation before the presentation revealed that young people have ambivalent, stereotypical or favourable perceptions of older people. The evaluation directly after the presentation showed a more nuanced description of older people, whereby younger people did not just describe them according to their identities as older people, but also described the relationship between young and old, and expressed an understanding for older people’s needs. In conclusion, the ethnodrama seemed to have an impact on younger people’s perceptions of older people, although stereotypical perceptions remained throughout the study. It is recommended that young people are encouraged to interact with older people from a young age in order to base their perceptions on first-hand accounts of experience gained through these interaction, and possibly dismiss any negative perceptions they may have. / MA (Psychology), North-West University, Potchefstroom Campus, 2014
15

Arthropod and plant diversity of maize agro-ecosystems in the grassland and savanna biomes of South Africa / Monique Botha

Botha, Monique January 2014 (has links)
Maize (Zea mays L.) is the most important grain crop in the country. Approximately 12 million tons of maize grain is produced annually on approximately 2.5 million ha of land. However, increased farming intensity can lead to fragmentation of habitat and has a tendency to decrease the biodiversity of an area. Therefore, to ensure the continued functionality of agro-ecosystems, methods in agriculture must be assessed and adapted when necessary to ensure the persistence of biological diversity. Unfortunately, the effect of crop production on species diversity and composition in South Africa is still relatively unknown, and no baseline data exists with which to gauge the possibility of unknown extinction risks of important biological elements. The objectives of this study were to compare plant and arthropod diversity patterns and species turnover of maize agro-ecosystems between biomes (grassland and savanna) and along a maize field-field margin gradient (MAFFMAG). Surveys of maize agro-ecosystems were conducted in six provinces of South Africa, namely North-West, Mpumalanga, KwaZulu-Natal, Limpopo, Free State and the Eastern Cape. Repeated measures ANOVA revealed a significantly lower plant and arthropod species diversity and richness in maize fields compared to field margins. Non-metric multidimensional scaling revealed that arthropod species composition differed between biomes although not along MAFFMAGs, indicating that arthropod species composition is dependent on biome rather than distance from maize field. Floristic data revealed unique species compositions for maize fields and field margins and also for biomes. Furthermore, maize fields and field margins of grassland sites were more similar in plant species composition than the savanna localities, suggesting higher regional beta diversity for savanna regions. Spearman‘s rank order correlations revealed generally positive but weak or no relationships between plant and arthropod diversity. This study provides baseline data for identification, monitoring and conservation of priority species and will allow the future evaluation of ecosystem services provided by plants and associated arthropods, especially natural enemies of pests, in maize agro-ecosystems. / MSc (Environmental Sciences), North-West University, Potchefstroom Campus, 2014
16

Exploration of mental health workers' coping strategies in dealing with children's trauma / Anna Elizabeth Keyter

Keyter, Anna Elizabeth January 2013 (has links)
Studies of MHWs, (social workers, social auxiliary workers, trauma counsellors, and telephone counsellors), who work with trauma and stress, often focus on pathological symptoms and on the need to develop psycho-education programmes (Figley, 2002; Johnson & Hunter, 1997; Mac Ritchie & Leibowitz, 2010; Mikulincer, 1994; Stiles, 2002). A gap was identified how MHWs, who continuously intervene with traumatised children, cope with the stressors associated with their work. The purpose of this research was to explore the coping strategies of Mental Health Workers (MHWs) exposed to Secondary Trauma (ST)as a result of having to deal day to day with children (younger than 18) who have experienced trauma, including sexual, physical and emotional abuse, as well as the witness of violence. The MHWs’ coping responses were investigated using a qualitative case study approach. The investigation showed how MHWs constructed their realities by examining their coping strategies and the individual meanings they assigned to these. A convenience sample, based on the availability of participants, was selected. Nine women and one man, ranging in age from 26 to 57 years, employed at Childline Gauteng, participated in the research. The Mmogo-Method®, a projective visual research technique, explored the MHWs’ coping experiences through qualitative data collection methods. Visual and textual data were gathered and analysed thematically. It was found that the MHWs at Childline Gauteng displayed two main coping styles, namely intrapersonal and relational coping strategies. In the face of their daily stressors, MHWs managed to cope successfully by using strategies that are embedded in their daily activities. Their ability to find alternative ways to cope, despite continuous exposure to children’s trauma, allowed the MHWs to fulfil their work obligations. Their intrapersonal coping strategies reflected an ability to draw on their inner resources. Being aware of their environment and how it affects them, MHWs were able to regulate themselves and their environments by adopting positive attitudes. These attitudes, and the MHWs’ dispositions, positively affected their outlook on life. Moreover, MHWs maintained a healthy distance from their stressful environment by means of meaningful disengagement. Meaningful disengagement was fundamental to creating solitude as a coping strategy. Personal and professional boundaries, self-care and being able to draw on spirituality were further coping resources. MHWs’ discussions about finding meaning in their work revealed that they would not be able to do their work if they did not experience it as spiritually significant. Drawing on external resources, relational coping strategies included supportive relationships with family, friends and colleagues. Reciprocal unconditional acceptance significantly contributed to coping because it was important for MHWs to experience family and friends' attitudes as supportive and non-judgemental. MHWs encountered an organisational culture of care in the form of freedom to interact with colleagues and managers and sharing experiences. This interaction contributed to successful coping because MHWs felt comfort in the knowledge that they were not alone when dealing with children's trauma. This interaction facilitated coping because MHWs were able to interface successfully with their environment, even in difficult circumstances. In conclusion, the MHWs provided nuanced descriptions of the ways in which they experienced coping strategies. They coped with the demands of their profession by using internal and external resources, including intrapersonal and relational coping. / MA (Research Psychology), North-West University, Potchefstroom Campus, 2014
17

Arthropod and plant diversity of maize agro-ecosystems in the grassland and savanna biomes of South Africa / Monique Botha

Botha, Monique January 2014 (has links)
Maize (Zea mays L.) is the most important grain crop in the country. Approximately 12 million tons of maize grain is produced annually on approximately 2.5 million ha of land. However, increased farming intensity can lead to fragmentation of habitat and has a tendency to decrease the biodiversity of an area. Therefore, to ensure the continued functionality of agro-ecosystems, methods in agriculture must be assessed and adapted when necessary to ensure the persistence of biological diversity. Unfortunately, the effect of crop production on species diversity and composition in South Africa is still relatively unknown, and no baseline data exists with which to gauge the possibility of unknown extinction risks of important biological elements. The objectives of this study were to compare plant and arthropod diversity patterns and species turnover of maize agro-ecosystems between biomes (grassland and savanna) and along a maize field-field margin gradient (MAFFMAG). Surveys of maize agro-ecosystems were conducted in six provinces of South Africa, namely North-West, Mpumalanga, KwaZulu-Natal, Limpopo, Free State and the Eastern Cape. Repeated measures ANOVA revealed a significantly lower plant and arthropod species diversity and richness in maize fields compared to field margins. Non-metric multidimensional scaling revealed that arthropod species composition differed between biomes although not along MAFFMAGs, indicating that arthropod species composition is dependent on biome rather than distance from maize field. Floristic data revealed unique species compositions for maize fields and field margins and also for biomes. Furthermore, maize fields and field margins of grassland sites were more similar in plant species composition than the savanna localities, suggesting higher regional beta diversity for savanna regions. Spearman‘s rank order correlations revealed generally positive but weak or no relationships between plant and arthropod diversity. This study provides baseline data for identification, monitoring and conservation of priority species and will allow the future evaluation of ecosystem services provided by plants and associated arthropods, especially natural enemies of pests, in maize agro-ecosystems. / MSc (Environmental Sciences), North-West University, Potchefstroom Campus, 2014
18

Exploration of mental health workers' coping strategies in dealing with children's trauma / Anna Elizabeth Keyter

Keyter, Anna Elizabeth January 2013 (has links)
Studies of MHWs, (social workers, social auxiliary workers, trauma counsellors, and telephone counsellors), who work with trauma and stress, often focus on pathological symptoms and on the need to develop psycho-education programmes (Figley, 2002; Johnson & Hunter, 1997; Mac Ritchie & Leibowitz, 2010; Mikulincer, 1994; Stiles, 2002). A gap was identified how MHWs, who continuously intervene with traumatised children, cope with the stressors associated with their work. The purpose of this research was to explore the coping strategies of Mental Health Workers (MHWs) exposed to Secondary Trauma (ST)as a result of having to deal day to day with children (younger than 18) who have experienced trauma, including sexual, physical and emotional abuse, as well as the witness of violence. The MHWs’ coping responses were investigated using a qualitative case study approach. The investigation showed how MHWs constructed their realities by examining their coping strategies and the individual meanings they assigned to these. A convenience sample, based on the availability of participants, was selected. Nine women and one man, ranging in age from 26 to 57 years, employed at Childline Gauteng, participated in the research. The Mmogo-Method®, a projective visual research technique, explored the MHWs’ coping experiences through qualitative data collection methods. Visual and textual data were gathered and analysed thematically. It was found that the MHWs at Childline Gauteng displayed two main coping styles, namely intrapersonal and relational coping strategies. In the face of their daily stressors, MHWs managed to cope successfully by using strategies that are embedded in their daily activities. Their ability to find alternative ways to cope, despite continuous exposure to children’s trauma, allowed the MHWs to fulfil their work obligations. Their intrapersonal coping strategies reflected an ability to draw on their inner resources. Being aware of their environment and how it affects them, MHWs were able to regulate themselves and their environments by adopting positive attitudes. These attitudes, and the MHWs’ dispositions, positively affected their outlook on life. Moreover, MHWs maintained a healthy distance from their stressful environment by means of meaningful disengagement. Meaningful disengagement was fundamental to creating solitude as a coping strategy. Personal and professional boundaries, self-care and being able to draw on spirituality were further coping resources. MHWs’ discussions about finding meaning in their work revealed that they would not be able to do their work if they did not experience it as spiritually significant. Drawing on external resources, relational coping strategies included supportive relationships with family, friends and colleagues. Reciprocal unconditional acceptance significantly contributed to coping because it was important for MHWs to experience family and friends' attitudes as supportive and non-judgemental. MHWs encountered an organisational culture of care in the form of freedom to interact with colleagues and managers and sharing experiences. This interaction contributed to successful coping because MHWs felt comfort in the knowledge that they were not alone when dealing with children's trauma. This interaction facilitated coping because MHWs were able to interface successfully with their environment, even in difficult circumstances. In conclusion, the MHWs provided nuanced descriptions of the ways in which they experienced coping strategies. They coped with the demands of their profession by using internal and external resources, including intrapersonal and relational coping. / MA (Research Psychology), North-West University, Potchefstroom Campus, 2014
19

Movement patterns and heart rate recordings of South African Rugby Union referees during actual match–play refereeing / Kraak W.J.

Kraak, Wilbur Julio January 2011 (has links)
Worldwide research regarding the movement patterns, heart rate recordings and work–to–rest ratios of rugby union referees is very limited. It is therefore very important to extend research regarding this topic. The first objective of this dissertation was to determine the frequency, duration and intensity of movement patterns and work–to–rest ratio of different refereeing panels of South African Rugby Union referees during match–refereeing at the National Club Rugby Championship in Stellenbosch during 2007. The second objective was to compare the two halves of the match with regard to the frequency, duration and intensity of the different movement patterns and the work–to–rest ratios of various of SARU referees during match–refereeing at the National Club Rugby Championship in Stellenbosch during 2007. The South African Rugby Union referees were monitored during match–refereeing by means of video and heart rate recordings for a total of 16 matches within a week tournament. The frequency and duration of the different movement patterns during both halves of the matches were analysed using a Dartfish TeamPro analysis software package. Heart rates were recorded during the matches to determine the movement pattern intensities of the referees for the duration of each match using a Suunto Team pack heart rate monitoring system. The work–to–rest ratios were determined by comparing the time (in seconds) spent working (lateral movements and sprinting) to the time spent resting (standing still, walking and jogging). The results revealed a moderate practical significant difference (d=0.51) between the mean frequency of jogging movement patterns for the different refereeing panels. A moderate practical significant difference was also found between the mean duration of jogging (d=0.43) and sprinting (d=0.43) movement patterns of different refereeing panels. The mean intensity of the movement patterns by the different refereeing panels showed large practical significant differences between the anaerobic threshold (d=3.68) and sub–threshold (d=1.36) levels and a moderate practical significant difference for the maximal heart rate zones (d=0.43). Both the provincial and contender panel referees had work–to–rest ratios of 1:4 during match–refereeing. In comparing the two halves of rugby match–refereeing, a large practical significant difference was found between the mean frequency of movement pattern values for standing still (d=2.53), walking (d=2.50), jogging (d=2.42), lateral movements (d=2.86) and sprinting (d=1.31) as well as for mean duration of movement pattern values for standing still (d=2.05), lateral movements (d=0.76) and sprinting (d=0.77). Large practical significant difference were found between the time spent in the maximal threshold (d=2.07), anaerobic threshold (d=0.92) and sub–threshold (d=7.90) heart rate zones measured during the two halves of match–refereeing. Average work–to–rest ratios of 1:3.5 and 1:5 were found for the first and second halves of rugby match–refereeing, respectively. The information gained regarding the activity profile of SARU referees could be used to determine the influence of rugby refereeing experience on the movement patterns and work–to–rest ratio of rugby referees. It can also provide information for constructing specific training programmes and drills in the development of rugby match–required fitness standards for referees. A key component of a rugby union referee’s game is positioning. Being in the right place at the right time is vital. The results of this study suggest that movements associated with positioning ? namely standing still, walking and lateral movements are the major components of the game of referees’ movement during match–refereeing. However, further research is required on this topic of research. / Thesis (M.A. (Sport Science))--North-West University, Potchefstroom Campus, 2012.
20

Movement patterns and heart rate recordings of South African Rugby Union referees during actual match–play refereeing / Kraak W.J.

Kraak, Wilbur Julio January 2011 (has links)
Worldwide research regarding the movement patterns, heart rate recordings and work–to–rest ratios of rugby union referees is very limited. It is therefore very important to extend research regarding this topic. The first objective of this dissertation was to determine the frequency, duration and intensity of movement patterns and work–to–rest ratio of different refereeing panels of South African Rugby Union referees during match–refereeing at the National Club Rugby Championship in Stellenbosch during 2007. The second objective was to compare the two halves of the match with regard to the frequency, duration and intensity of the different movement patterns and the work–to–rest ratios of various of SARU referees during match–refereeing at the National Club Rugby Championship in Stellenbosch during 2007. The South African Rugby Union referees were monitored during match–refereeing by means of video and heart rate recordings for a total of 16 matches within a week tournament. The frequency and duration of the different movement patterns during both halves of the matches were analysed using a Dartfish TeamPro analysis software package. Heart rates were recorded during the matches to determine the movement pattern intensities of the referees for the duration of each match using a Suunto Team pack heart rate monitoring system. The work–to–rest ratios were determined by comparing the time (in seconds) spent working (lateral movements and sprinting) to the time spent resting (standing still, walking and jogging). The results revealed a moderate practical significant difference (d=0.51) between the mean frequency of jogging movement patterns for the different refereeing panels. A moderate practical significant difference was also found between the mean duration of jogging (d=0.43) and sprinting (d=0.43) movement patterns of different refereeing panels. The mean intensity of the movement patterns by the different refereeing panels showed large practical significant differences between the anaerobic threshold (d=3.68) and sub–threshold (d=1.36) levels and a moderate practical significant difference for the maximal heart rate zones (d=0.43). Both the provincial and contender panel referees had work–to–rest ratios of 1:4 during match–refereeing. In comparing the two halves of rugby match–refereeing, a large practical significant difference was found between the mean frequency of movement pattern values for standing still (d=2.53), walking (d=2.50), jogging (d=2.42), lateral movements (d=2.86) and sprinting (d=1.31) as well as for mean duration of movement pattern values for standing still (d=2.05), lateral movements (d=0.76) and sprinting (d=0.77). Large practical significant difference were found between the time spent in the maximal threshold (d=2.07), anaerobic threshold (d=0.92) and sub–threshold (d=7.90) heart rate zones measured during the two halves of match–refereeing. Average work–to–rest ratios of 1:3.5 and 1:5 were found for the first and second halves of rugby match–refereeing, respectively. The information gained regarding the activity profile of SARU referees could be used to determine the influence of rugby refereeing experience on the movement patterns and work–to–rest ratio of rugby referees. It can also provide information for constructing specific training programmes and drills in the development of rugby match–required fitness standards for referees. A key component of a rugby union referee’s game is positioning. Being in the right place at the right time is vital. The results of this study suggest that movements associated with positioning ? namely standing still, walking and lateral movements are the major components of the game of referees’ movement during match–refereeing. However, further research is required on this topic of research. / Thesis (M.A. (Sport Science))--North-West University, Potchefstroom Campus, 2012.

Page generated in 0.0531 seconds