1. Chelinzev, G. V., and Ossetrova, E. D., J. Gen. Chem., 5, 10 (1940) (in Russian).
2. Gause, G. F., and Alpatov, V. V., C.R. Acad. Sci. U.S.S.R., 32, No. 7 (1941) (in English).
3. Gause, G. F., Biochemistry, 7, No. 1–2 (1942) (in Russian).
4. Kögl, F., and Erxleben, H., Z. physiol. Chem., 261 (1939).
5. Waldschmidt-Leitz, E. K., and Mayer, K., Z. physiol. Chem., 262 (1939).