1. Shimkin, M., Contrary to Nature, Washington, DC, US Government Printing Office, 1977, p. 498.
2. Fraumeni, J. F., ed., Persons at High Risk of Cancer, Academic Press, New York, 1975, p. 544.
3. Hiatt, H. H., Watson, J. D., and Winsten, J. A., eds., Origins of Human Cancer. Book C, Cold Spring Harbor Laboratory, Cold Spring Harbor, 1977, pp. 1307–1889.
4. Higginson, J., and Muir, C.S., J. Natl. Cancer Inst. 63, 1291 (1979).
5. International Agency for Research on Cancer, An Evaluation of Chemicals and Industrial Processes Associated with Cancer in Humans Based on Human and Animals Data, IARC Monograph vol. 1–20, Cancer Res. 40, 1 (1980).