1. Coman, D. R., Cancer Res., 13, 397–404 (1953).
2. Zeidman, I., Cancer Res., 17, 157–162 (1957).
3. Fidler, I. J., in Biology of Tumors, Cancer: A Comprehensive Treatise, 3 (edit. by Becker, F. F.), (Plenum, New York, in the press).
4. Fisher, B., and Fisher, E. R., Cancer Res., 27, 412–420 (1967).
5. Fidler, I. J., J. natn. Cancer Inst., 45, 775–782 (1970).