1. Fearon E.R., Vogelstein B.: A genetic model for colrectal tumorigenesis. Cell, 61: 759, 1990.
2. Hollingsworth R.E., Lee W-H.: Tumor suppressor genes: New prospects for cancer research. J.N.C.I., 83: 91, 1991.
3. Knudson A.G.: Hereditary cancer, oncogenes and antioncogenes. Cancer Res., 45: 1437, 1985.
4. Nowell P.C.: How many human cancer genes? J.N.C.I. 83: 1061, 1991.
5. Sporn M.B.: Carcinogenesis and cancer: Different perspectives on the same disease. Cancer Res., 51:6215, 1991.