Immunology of reproduction proceedings of the second International Symposium, held in Varna, Bulgaria, Sept. 13-16, 1971 - Bratanov, K..; International Symposium on Immunology of Reproduction, 2nd, Varna, Bulgaria, 1971. (Sofia, Bulgaria Bulgarian Academy of Sciences Press, 1973)
"Title and text in English and Russian."
Keywords: Immunology -- Congresses; Reproduction -- Congresses