1. Bertrand, G., C.R. Acad. Sci., Paris, 121, 166 (1895).
2. Dawson, C. R., and Tarpley, W. B., in “The Enzymes”, 2, 454 (edit. J. B. Sumner and K. Myrbäck, Acad. Press, New York, 1951).
3. Singer, T. P., and Kearney, E. B., in “The Proteins”, 2 A, 123 (1954).
4. Mallette, M. F., and Dawson, C. R., Arch. Biochem., 23, 29 (1949).
5. Heymann, H., Rogach, Z., and Mayer, R. L., J. Amer. Chem. Soc., 76, 6330 (1954).