by Usmanov, Sh. R., Yakubov, I. T., Rakhimov, M. M.
Published in Chemistry of natural compounds (01.07.1998)

by Volobuev, M. I., Karamyshev, S. B., Mukhamedyarov, R. D., Usmanov, R. Sh
Published in Journal of applied spectroscopy (01.01.1992)