1. Belitsina, N.V., Ajtkhozhin, M.A., Gavrilova, L.P. and Spirin, A.S., Biokhimiya 29, 363?374 (1964).
2. Spirin, A.S., Belitsina, N. V. and Ajtkhozhin, M. A., Zh. Obshch. Biol. 25, 321?337 (1964); Federation Proc. 24, T907?T922 (1965).
3. Spirin, A.S.: in A.A. Moscona and A. Monroy (eds.), Curr. Topics Dev. Biol., Academic Press, New York, 1966, Vol. 1, pp. 1?38.
4. Samarina, O.P., Asriyan, I.S. and Georgiev, G.P., Dokl. Akad. Nauk SSSR 163, 1510?1513 (1965).
5. Samarina, O.P., Krichevskaya, A.A. and Georgiev, G.P., Nature 210, 1319?1322 (1966).