1. Heidelberger, M., Kendall, F. E., and Soo Hoo, C. M., J. Exp. Med., 58, 137 (1933).
2. Kabat, E. A., and Heidelberger, M., J. Exp. Med., 66, 229 (1937).
3. Kabat, E. A., and Mayer, M. M., Experimental Immunochemistry (Ch. C. Thomas, Springfield, Ill., 1958).
4. Mathé, G., Tran Ba Loc, and Bernard, J., C.R. Soc. Biol., Paris, 246, 1626 (1958).
5. DeCarvalho, S., Cancer, 16, 306 (1963).