1. Bird, R. P. (1987) Cancer Lett., 37, 147 - 151.
2. McLeUan, E. & Bird, R. P. ( 1988a) Cancer Res., 48.6183 - 6186.
3. MeUllan, E. A. & Bird, R. P. ( 1988b) Cancer Res., 48.6187- 6192.
4. Dcschncr, E. E., Long, F. C. & Maskens, A P. (1979) Cancer Lett., 8, 23 - 28.
5. International Agency for Research on Cancer (1ARC) (1978) 17,27 - 255.
6. Schiller, C. M.. Curley, W. H. & McConncl. E. E. (1980) Cancer Lett., 11,75 - 79.
7. Reddy, B. S., Narisawa, T., Maronpou R., Weisburger, J. H. & Wynder, E. L. (1975) Cancer Res., 35. 3421 - 3426.
8. Hirano, I., Shibuya, C. (1972) in. Topics in Chemical Carcinogenesis (Nakahara. W., Takayama, S., Sugimura, T. & Odashima, S., eds) p. 12I.Tokyo, University of Tokyo Press.