Metabolism and enzymology of nucleic acids : proceedings of the fourth international symposium on metabolism and enzymology of nucleic acids organized by the Institute of molecular biology, Slovak Academy of Sciences, Bratislava, Czechoslovakia : Head at Smolenice Castle, June 8-11, 1981 4 - Zelinka, Ján, 1922-2009; Balan, Jozef, 1929- (Veda, 1982)