1. Banaszak, L.J., Bradshaw, R.A., (1975). The enzymes, P.D. Boyer, ed., 3rd ed., Vol. XI, p. 369. New York: Academic Press
2. Barron, E.S.G., Singer, T.P. (1943). Science97, 356
3. Bieber, H., Zimmermann, W., (1971). Zbl. Bakt., I. Abt. Orig.217, 47
4. Dickerson, R.E., Timkovitch, R. (1975). The enzymes, P.D. Boyer, ed., 3rd ed., Vol. XI, p. 397. New York: Academic Press
5. Friedman, M. (1973). The chemistry and biochemistry of the sulfhydryl group in amino acids., peptides and proteins. New York: Pergamon Press