Ovezdurdyev, A.; Abdullaev, N. D.; Yusupov, M. I.; Kasymov, Sh. Z.
Chemistry of Natural Compounds, 1987 , vol. 23, # 5 p. 553 - 556
Khimiya Prirodnykh Soedinenii, 1987 , vol. 23, # 5 p. 667 - 671