1. Koprowska, I., and Koprowski, H., Cancer Res., 13, 651 (1953).
2. Love, R., Koprowski, H., and Cox, H. R., Cancer Res., 13, 350 (1953).
3. Werder, A. A., Kirschbaum, A., MacDowell, E. C., and Syverton, J. T., Cancer Res., 12, 866 (1952).
4. Nungester, W. J., and Fisher, H., Cancer Res., 14, 284 (1954).
5. McKee, R. W., Lonberg-Holm, K., and Jehl, J., Cancer Res., 13, 537 (1953).