1. T. Nara, R. Okachi and F. Kato, Abstracts of Papers, 4th International Fermentation Symposium, Kyoto, Japan, March, 1972, p. 207.
2. R. Okachi, F. Kato, Y. Miyamura and T. Nara, Abstracts of Papers, Annual Meeting of the Agricultural Chemical Society of Japan, Send ai, Japan, April, 1972, p. 153.