1. Migration of the germ cells of human embryo from the yolk sac to the primitive gonadal folds;Witschi;Contr Embryol Carnegie Inst,1948
2. The identification, origin and migration of the primordial germ cells in the mouse embryo;Chiquoine;Anat Rec,1954
3. Embriology of the ovary;Witschi,1962
4. Ovarian changes;Brambell,1956
5. Weibliche Genitalorgane. Das Ovarium;Watzka,1957