1. N. R. Krieg and J. G. Holt, “Bergey’s Manual of Systematic Bacteriology,” Vol. 1, Williams and Wilkins Co., Baltimore, London, 1984, pp. 471–476.
2. H. Nagai, H. Ishikura, and T. Hayashi, “Segel Biochemical Calculations” (in Japanese), Hirokawa Shoten Co., 1979, pp. 317.