1. L. B. Mekler, Biofizika,12, 569 (1967).
2. I. P. Ashmarin, Zh. Évol. Biokhim. Fiziol.,9, 217 (1973).
3. I. P. Ashmarin and A. E. Antipenko, Zh. Mikrobiol.,12, 59 (1973).
4. N. K. Jerne, Sci. Amer.,229, 52 (1973).
5. I. P. Ashmarin, Riddles and Discoveries in the Biochemistry of Memory [in Russian], LGU, Leningrad (1975).