1. Kuratsune, M., u.W. C. Hueper: J. Nalt. Cancer Inst.24, 463?469 (1960).
2. Gilbert, J. S., u.A. J. Lindsey: Brit. J. Cancer11, 398 (1957).
3. Dansi, A., u.C. Zanini: Estratto Tumori45, 65 (1959).
4. Chassevent, F., u.M. Heros: Caf�, cacao, th�,7, (4), 349 (1963).