Simakov, S. V.; Velezheva, V. S.; Kozik, T. A.; Ershova, Yu. A.; Chernov, V. A.; Suvorov, N. N. Pharmaceutical Chemistry Journal, 1983 , vol. 17, # 10 p. 707 - 712 Khimiko-Farmatsevticheskii Zhurnal, 1983 , vol. 17, # 10 p. 1183 - 1188