1. J. Kohn, “Chromatographic and Electrophoretic Techniques,” Vol. II, William Heinmann Medical Books, Ltd., London, 1960, p. 56.
2. E. Racker, “Methods in Enzymology,” Vol. I. ed by S. P. Colowick and N. O. Kaplan, Academic Press, Inc., New York, N. Y., 1955, p. 500.
3. B. Chance and A. C. Maehly, “Methods in Enzymology,” Vol. II, ed by S. P. Colowick and N. O. Kaplan, Academic, Press, Inc., New York, N. Y., 1955, p. 764.