1. N. M. Berezhnaya, Principles of Immunity (Moscow, 1956), p. 185.
2. V. I. Luk'yanenko, Papers and Reports of the Conference of Young Scientists of the Institute of Experimental Biology of the Academy of Medical Sciences, USSR (Moscow, 1960), p. 8.
3. D. G. Manolov and I. I. Milyan, Zhur. Mikrobiol. Epidemiol. i Immunobiol. No. 12 (1953), p. 34.
4. P. D. Marchuk, Principles of Immunity (Moscow, 1956), p. 69.
5. Z. E. Matusis and V. V. Sherstobitova, Principles of Immunity (Moscow, 1956), p. 129.