1. Magnus, R.: Lane Lectures on experimental Pharmacology and Medicine 1930, S. 73, Stanford University Press.
2. Trendelenburg, P.: Naunyn-Schmiedebergs Arch.81 (1917).
3. Biochem. Z.72 (1916).
4. Naunyn-Schmiedebergs Arch.169 (1933).
5. J. of Physiol.87, 399 (1936).