Bornovalova, G. V.; Korolev, G. K.; Kurasova, V. G.; Kaunova, M. V. Pharmaceutical Chemistry Journal, 1981 , vol. 15, # 6 p. 379 - 382 Khimiko-Farmatsevticheskii Zhurnal, 1981 , vol. 15, # 6 p. 17 - 21