1. German, J. Progr. Med. Genet. 8, 61–101 (1972).
2. Harnden, D. G. in Chromosomes and Cancer (ed. German, J.) 619–636 (Wiley, New York, 1974).
3. Robbins, J. H., Kraemer, K. H., Lutzner, M. A., Festoff, B. W. & Coon, H. G. Annls int. Med. 80, 221–248 (1974).
4. Takabe, H. et al. Cancer Res. 37, 490–495 (1977).
5. Bridges, B. A. Nature 261, 195–200 (1976).