1. Delong, D.C., et al.: Abstr. 78th Ann. Meeting, Am. Soc. Microbiol., p. 234 (1978)
2. Wu, C.Y.E., et al.: ibid., p.234
3. Mayer, G.D., et al.: Abstr. 18th Intersci. Conf. Antimicrob. Agents Chemother., p. 220 (1978)
4. Ash, R.J., et al.: ibid., p. 221
5. Tamm, I., Folkers, K., Horsfall, F.L.: Yale J. Biol. Med. 24, 559 (1952)