1. Bertrand, G., and Vladesco, R., C.R. Acad. Sci., Paris, 173, 176 (1921).
2. Mawson, C. A., and Fischer, M. I., Canad. J. Med. Sci., 30, 336 (1952).
3. Hoare, R., Delory, G. E., and Penner, D. W., Cancer, 9, 721 (1956).
4. Mawson, C. A., and Fischer, M. I., Biochem. J., 55, 696 (1953).
5. Mawson, C. A., and Fischer, M. I., Nature, 177, 190 (1956).