1. N. O. Kaplan and M. M. Ciotti, ‘Methods in Enzymology,’ Vol. Ill, ed. by S. P. Colowick and N. O. Kaplan, Academic Press Inc., New York, N. Y., 1957, p. 253.
2. E. Bernt and I. Gutmann, ‘Methods of Enzymatic Analysis,’ Voi. Ill, ed. by H. U. Bergmeyer, Academic Press Inc., New York, N. Y., 1974, p. 1499.
3. W. A. Wood, R. A. Fetting and B. C. Hertlein, ‘Methods in Enzymology,’ Vol. V, ed. by S. P. Colowick and N. ö, Kaplan, Academic Press Inc., New York, N. Y., 1962, p. 287.
4. H. Sund and J. Theorell, ‘The Enzymes,’ 2nd ed., Vol. 7, ed. by P. D. Boyer, H. Lardy and K. Myrback, Academic Press Inc., New York, N. Y., 1963, p. 57.