1. Melander, B., Antib. Chemother., 10, 34 (1960).
2. Ludwig, K. A., Ruchman, I., and Murray, F. J., Proc. Soc. Exp. Biol. Med., 100, 495 (1959).
3. Greene, M. O., and Greenberg, J., Cancer Res., 20, 1166 (1960).
4. Freedlander, B. L., and French, F. A., Cancer Res., 18, 360 (1958).
5. Mihich, E., Mulhern, A. I., and Hornung, N., Cancer Res., 20, 609 (1960).