1. M. L. Belen'kii and M. A. Vitolinya. In the book: Proceedings of the Tenth All-Union Conference on Pharmacologists, Toxicologists, and Chemotherapists [in Russian], Volgograd (1962), p. 42.
2. A. F. Danilov, In the book: The Physiological Role of Acetylcholine and the Search for New Therapeutic Substances [in Russian], Leningrad (1957), p. 406.
3. A. I. Mitrofanov, In the book: Gangliolytics and Blocking Agents of Neuromuscular Synapses [in Russian], Leningrad (1958), p. 130.
4. D. S. Paskov, Nivalin. Its Pharmacological Characteristics [in Russian], Sofia (1959).
5. D. M. Aviado, Am. J. med. Sci., Vol. 241 (1961), p. 650.