1. Abe, S., S. Takeuchi and H. Yonehara: J. Antibiot. Ser. A 12, 201–202 (1959).
2. Akabori, H., and M. Nakamura: J. Antibiot. Ser. A 12, 17–20 (1959).
3. Anderson, P. A.: J. gen. Physiol. 36, 733–737 (1953).
4. Andreev, K. P.: Continuous cultivation of microorganisms, a symposium. S. 186–197. Prag 1958.
5. Arai, T., and M. Suzuki: J. Antibiot. Ser. A 9, 169–171 (1956).