Zhikhareva, G. P.; Mastafanova, L. I.; Evstratova, M. I.; Shvarts, G. Ya.; Syubaev, R. D.; et al. Pharmaceutical Chemistry Journal, 1980 , vol. 14, # 2 p. 119 - 123 Khimiko-Farmatsevticheskii Zhurnal, 1980 , vol. 14, # 2 p. 45 - 49