1. L. S. Volkova, Immunobiological Relations between Mother and Fetus [in Russian], Moscow (1970).
2. O. E. Vyazov, The Immunology of Embryogenesis [in Russian], Moscow (1962).
3. E. V. Gubler and A. A. Genkin, The Application of Nonparametric Statistical Criteria to Medical and Biological Research [in Russian], Leningrad (1973).
4. E. A. Fedosov, Zh. Mikrobiol., No. 10, 87 (1974).
5. E. A. Fedosov, Dokl. Akad. Nauk SSSR,222, 472 (1975).