Abyshev, A. Z.; D'yachuk, G. I.; Semenov, E. V.; Pukhov, M. P. Pharmaceutical Chemistry Journal, 1993 , vol. 27, # 11 p. 766 - 770 Khimiko-Farmatsevticheskii Zhurnal, 1993 , vol. 27, # 11 p. 34 - 38