1. V. N. Andreev and G. I. Podoprigora, Pat. Fiziol., No. 2, 83 (1976).
2. V. Kh. Vulchanov, Phagocytosis, Athrocytosis, and Immunogenesis [in Russian], Sofia (1966).
3. Ch. Nikolov, Vupr. Khemat. Kruvopr.,7, 27 (1960).
4. E. V. Kholodkova, Zh. Mikrobiol., No. 5, 134 (1969).
5. J. Bonin and L. Schwartz., Blood,9, 773 (1954).