1. V. A. Aleksandrov, Doklady Akad. Nauk SSSR, 159, No. 4, 918 (1964).
2. A. P. Dyban and I. M. Akimova, Akush. i Gin., No. 6, 21 (1965).
3. V. M. Mikhailov, in the book: Proceedings of a Conference of Undergraduate and Postgraduate Students of Morphologic Departments and Laboratories of Leningrad Teaching and Research Institutes [in Russian], Leningrad (1965), p. 37.
4. P. g. Svetlov, in the book: The Pathophysiology of Intrauterine Development [in Russian], Leningrad (1959), p. 114.
5. W. H. Beierwaltes et al., Endocrinology, 69 (1961), p. 863.