Evaluation of embryotoxicity, mutagenicity and carcinogenicity risks in new drugs : proceedings of the 3rd Symposium on Toxicological Testing for Safety of New Drugs, Praha, April 6-8, 1976 - Benešová, Olga, 1922-2005; Rychter, Zdeněk, 1924-2011; Jelínek, Richard, 1934-2008 (Univerzita Karlova, 1979)