1. Mobitz undGrosse, Arch. f. exper. Path.118, H. 3–4 (1926).
2. Starr undGamble, J. of biol. Chem.71, Nr 2 (1927).
3. Wright undKremer, J. of Physiol.
4. Henderson, Amer. J. Physiol.82 (1925).
5. Broklehurst, Haggard undHenderson, Amer. J. Physiol.73, Nr 3 (1927).