1. Baker TG, Franchi LL: Fine structure of oogonia and oocytes in human ovaries. J Cell Sci 2: 213–224, 1967.
2. Byskov AG: Sexual differentiation of the mammalian ovary. In: Biology of the Ovary. Developments in Obstetrics and Gynecology. Vol 2. PM Motta, ESE Hafez (eds), The Hague-Boston-London: Martinus Nijhoff Publ, p 3–15, 1980.
3. Byskov AG: Gonadal sex and germ cell differentiation. In: Mechanism of Sex Differentiation in Animals and Man. CR Austin RG Edwards (eds), London: Academic Press, p 145–164, 1981.
4. Dvorak M, Tesarik J: Ultrastructure of human ovarian follicles. In: Biology of the Ovary. Developments in Obstetrics and Gynecology. Vol 2. PM Motta, ESE Hafez (eds), The Hague-Boston-London: Martinus Nijhoff Publ, p 121–137, 1980.
5. Gondos B, Bhiraleus P, Hobel CL: Ultrastructural observations on germ cells in the human fetal ovaries. Am J Obstet Gynecol 110: 644–652, 1971.