1. H. K. Schachman, “Method in Enzymology,” Vol. 4, ed. by S. P. Colowick and N. O. Kaplan, Academic Press, New York, 1957, p. 32.
2. T. Svedberg and K. O. Pedersen, “The ultracentrifuge,” Oxford University Press, New York, 1940.
3. W. R. Hudgins and F. G. Brown, “Symposium on Pyridoxal Enzymes,” ed. by K. Yamada, N. Katsunuma and H. Wada, Maruzen Co., Ltd., Tokyo, 1968, p. 97.