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2. E. Bernt and H. Bergmeyer, “Methods of Enzymatic Analysis,” ed. by H. U. Bergmeyer, Academic Press, New York, 1974, p. 1506.
3. E. Racker, “Methods of Enzymatic Analysis,” ed. by H. U. Bergmeyer, Academic Press, New York, 1974, p. 1342.
4. A. K. Ganguly, “Topics in Antibiotic Chemistry,” Vol. 2, ed. by P. G. Sammes, Wiley, New York, 1978, p. 59.