1. O. D. Bird and R. Q. Thompson, “The Vitamins,” Vol. VII, ed. by P. Gyorgy and W. N. Pearson, Academic Press, Inc., New York, N. Y., 1967, p. 225.
2. J. Kohn, “Chromatographic and Electrophoretic Techniques,” Vol. II, William Heinemann Medical Books, Ltd., London, 1960, p. 56.
3. 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.
4. 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.
5. J. F. Taylor, “Methods in Enzymology,” Vol. I, ed. by S. P. Colowick and N. O. Kaplan, Academic Press, Inc., New York, N., 1955, p. 310.