Oganesyan, G. B.; Galstyan, A. M.; Mnatsakanyan, V. A.; Shashkov, A. S.; Agababyan, P. V.
Chemistry of Natural Compounds, 1991 , vol. 27, # 5 p. 556 - 559
Khimiya Prirodnykh Soedinenii, 1991 , # 5 p. 630 - 634