1. P. Hirsch, “Annual Review of Microbiology,“ Vol. 28, ed. by C. E. Clifton, S. Raffel and M. P. Starr, Annual Review Inc., Palo Alto, Carifornia, U.S.A., 1974, p. 391.
2. W. Harder and M. M. Attwood, “Advances in Microbial Physiology,” Vol. 17, ed. by A. H. Rose and D. W. Tempest, Academic Press, New York, U.S.A., 1978, p. 303.
3. F. M. Huennekens, C. K. Mathews and K. G. Scrimgeour, “Methods in Enzymology,” Vol. VI, ed. by S. P. Colowick and N. O. Kaplan, Academic Press Inc., New York, 1963, p. 802.
4. K. Kusama, “Seikagaku Zikken Kouza,” Vol. 6, ed. by The Japanese Biochemical Society, Tokyo Kagaku Douzin, Tokyo, Japan, 1977, p. 87.