1. J. Körbler, “Geschichte der Krebskrankheit” (“The History of Cancer”, in German), Verlag Dr. H. Renner, Wien 1973, p. 67.
2. J. Körbler, “Geschichte der Krebskrankheit” (“The History of Cancer”, in German), Verlag Dr. H. Renner, Wien 1973, p. 140.
3. K. Yamagiwa and K. Ischikawa, Proc. Med. Fac. Tokyo Univ. 15, 255 (1916).
4. R. Shapiro and Pohl, Biochemistry 7,448 (1968).
5. E. I. Budowsky, Proc. Nucleic Acid Res. Mol. BioI. 16, 125 (1976).