1. Dunning, Curtis, Bullock, Amer. J. Canc.28, 681 (1936).
2. Morton, I., Surg. etc.72, 345 (1941). Ref. Z. Krebsforsch.53, H. 1, 13 (1942).
3. Brock, Druckrey u.Hamperl, Arch. f. exper. Path.189, 709 (1936).
4. Peacock u.Beck, Brit. J. exper. Path.19, 315 (1938).
5. Hieger, I., Amer. J. Canc.28, 522 (1936).