Vinogradova, V. I.; Yunusov, M. S.
Chemistry of Natural Compounds, 1984 , vol. 20, # 3 p. 308 - 311
Khimiya Prirodnykh Soedinenii, 1984 , # 3 p. 331 - 334

Shvedov,V.I. et al.
Pharmaceutical Chemistry Journal, 1979 , vol. 13, # 3 p. 256 - 260
Khimiko-Farmatsevticheskii Zhurnal, 1979 , vol. 13, # 3 p. 34 - 39