1. J. E. Zajic and E. Knettig, “Developments in Industrial Microbiology,” American Institute of Biological Science, Washington D. C., 1971, pp. 87–98.
2. S. Shinohara, Japanese Patent (Kokai Koho) S54-55798 (1979) (in Japanese).
3. K. Katoh and T. Suzuki,Nogiken-Hokoku (B)(Bulletin National Inst. Agric. Science, (B)), 30, 73 (1979). (in Japanese)