Evaluation of embryotoxicity, mutagenicity and corcinogenocity risks in new drugs : proceedings of the 3. symposium on "Toxicological testing for safety of new drugs", Praha, April 6-8, 1976 - Benešová, Olga, 1922-2005; Rychter, Zdeněk, 1924-2011; Jelínek, Richard (Univ. Karlova, 1979)