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Weerapong Koykul. 1996. Factors affecting germ cell survival in mammals. Faculty of Graduate Studies, University of Guelph;
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Weerapong Koykul. Factors affecting germ cell survival in mammals. . [S.l.]:University of Guelph, 1996.
Weerapong Koykul. (1996) Factors affecting germ cell survival in mammals . University of Guelph/[S.l.].