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2. R. Ballentine, “Methods in Enzymology,” Vol. 3 ed. by S. P. Colowick and N. O. Kaplan, Academic Press, New York, 1957, p. 984.
3. J. F. Thompson, “Methods in Enzymology,” Vol. 17A, ed. by H. Tabor and C. W. Tabor, Academic Press, New York, 1970, p. 894.
4. F. Feigl, “Spot Tests in Organic Analysis,” 7th English Ed., Elsevier Publishing, Amsterdam, 1966, pp. 208 ~ 209.