1. Boutwell, R.K. (1974): The function and mechanism of promoters of carcinogenesis. CRC Crit. Rev. Toxicol. 2: 419–443.
2. Boutwell, R.K. (1978): Biochemical mechanism of tumor promotion. In: T.J. Slaga, A. Sivak and R.K. Boutwell (eds.), Carcinogenesis: Mechanisms of Tumor Promotion and Cocarcinogenesis, Vol. 2. New York: Raven Press, pp. 49–58.
3. Chang, C.C., Trosko, J.E., Warren, S.T. (1978): In vitro assay for tumor promoters and anti-promoters. J. Environ. Pathol. Toxicol. 2: 43–64.
4. Cohen, S.M. Arai, M., Jacobs, J.B., Friedell, G.H. (1979): Promoting effect of saccharin and DL-tryptophan in urinary bladder carcinogenesis. Cancer Res. 39: 1207–1217.
5. Diamond, L., O’Brien, T.G., Rovera, G. (1978): Tumor promoters; Effects on proliferation and differentiation of cells in culture. Life Sci. 23: 1979–1988.