1. M. D. Mashovskii, Medicinal Substances [in Russian], Chapter 2, Moscow (1972), p. 66.
2. H. Dobson and R. J. Fitzpatrick, J. Reprod. Fertil.,43, 337 (1975).
3. B.V. Verigin, A. P. Makeeva, and A. B. Burlakov, Tr. Vses. Nauchno-Issled. Inst. Morskogo Rybnogo Khoz-va Okeanografii, No. 3, 143 (1975).
4. O. N. Savchenko, Ovarian and Gonadotrophic Hormones [in Russian], Leningrad (1967).
5. P. A. Katzman and E. A. Doisey, J. Biol. Chem.,98, 739 (1932).