1. Bülman, E., Ann. d. Chemie15, 109 (1921);16, 321 (1921).
2. , Bull. Soc. Chim. biol. Paris41, 213 (1927).
3. Cori, C. undCori, G., J. of biol. Chem.64, 11 (1925).
4. Corran, J. W., andC. M. W. Lewis, Biochemic. J.18, 1359 (1924).
5. Harde, E. C. r. Soc. Biol.94, 1346 (1926).