Limanov, V. E.; Ivanov, S. B.; Sukiasyan, A. N.; Skvortsova, E. K.
Pharmaceutical Chemistry Journal, 1981 , vol. 15, # 6 p. 383 - 387
Khimiko-Farmatsevticheskii Zhurnal, 1981 , vol. 15, # 6 p. 39 - 43

Continental Pharma Inc.
Patent: US4639468 A1, 1987 ;