Shiryaev, A. K.; Moiseev, I. K.; Boreko, E. I.; Korobchenko, L. V.; Vladyko, G. V. Pharmaceutical Chemistry Journal, 1990 , vol. 24, # 5 p. 339 - 343 Khimiko-Farmatsevticheskii Zhurnal, 1990 , vol. 24, # 5 p. 23 - 25