1. Survey of compounds which have been tested for carcinogenic activity, Federal Security Agency, Public Health Service Publications No 149, 2. Aufl. Bethesda 1951.
2. Lipschütz, A.: Steroidhormons and Tumors. Baltimore 1950.
3. Lacassagne, A.: C. r. Soc. Biol. Paris132, 365 (1939).
4. Querner, H.: Naturwiss.40, 145 (1953).
5. Loeb, L., E. L. Burns, V. Sunzteff andM. Moskop: Amer. J. Canc.30, 47 (1937).