1. L. V. Belousov, The Problem of Embryonic Morphogenesis [in Russian], Moscow (1971).
2. V. V. Malakhov and V. G. Cherdantsev, Zool. Zh., No. 2, 162 (1975).
3. L. V. Polezhaev, Usp. Sovrem. Biol.,8, 467 (1938).
4. N. A. Plokhinskii, Biometrics [in Russian], Moscow (1970).
5. N. Yu. Sakharova, Nauch. Dokl. Vyssh. Shkoly, Ser. Biol. Nauki, No. 4, 48 (1965).