| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:315643 |
| Date | January 1990 |
| Creators | Cerrilla, Maria Esther Ortega |
| Publisher | University of Newcastle Upon Tyne |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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