1. S. M. Bychkov, in: Progress in Biological Chemistry [in Russian] (Moscow, 1950), Vol. 1, p. 456.
2. E. Ya. Geiman, Uspekhi Sov. Biol.23, 3, 324 (1947).
3. F. A. Gluzman, Med. Zhur. Ukrain.20, 63 (1950).
4. L. G. Smirnova, in: Advances in Modern Biochemistry [in Russian] (Moscow, 1947) Vol. 1, p. 302.
5. V. A. Chepurin, Byull. Éksp. Biol. Med.5, 99 (1960). Original Russian pagination. See C. B. translation.