1. Emmrich, R.: Z. exper. Med.109, 604 (1941).
2. Felix, K. u.R. Teske, Hoppe-Seylers Z.267, 174 (1940).
3. Krusius, F. E.: Acta physiol. scand. 2, Suppl. III (1939).
4. Simon, E. u.C. Neuberg: Biochem. Z.232, 479 (1930).
5. Case: Biochemic. J.26, 753 (1932).