1. Bruce, W. R., Varghese, A. J., Furrer, R., and Land, P. C. A mutagen in feces of normal humans, in Origins of Human Cancer, Book C, Cold Spring Harbor Conferences on Cell Proliferation, vol.4, Hiatt, H. H., Watson, J. D., and Winsten, J. A., Eds., Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, 1977, 1641.
2. Chromosome breaking activity of human feces and its enhancement by transition metals
3. Venitt, S., Faecal mutagens in the aetiology of colonic cancer, inColonic Carcinogenesis, Falk Symposium 31, Malt, R. A. and Williamson, R. C. N., Eds., MTP Press, Lancaster, England, 59, 1982.