Thesis (Ph. D.)--University of Iowa, 2007. / Thesis supervisor: Gary E. Christensen. Includes bibliographical references (leaves 159-173).
| Identifer | oai:union.ndltd.org:OCLC/oai:xtcat.oclc.org:OCLCNo/295894397 |
| Date | January 2007 |
| Creators | Geng, Xiujuan. |
| Source Sets | OCLC |
| Language | English |
| Detected Language | English |
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