1. G. W. Camiener et al., Antimicrob. Agents Ann., 494 (1960).
2. W. A. Remers, “The Chemistry of Antitumor Antibiotics,” Vol. 1, John Wiley & Son’s, New York, 1979.
3. D. Perlman, Cancer Chemother. Rep., 58, 93 (1974).
4. J. Kawamata, H. Fujita and R. Ikegami, J. Antibiot. Ser. A, 13, 415 (1960).
5. E. B. Sirling and D. Gottlieb, Int. J. Syst. Bacteriol, 16, 313 (1966).