Romanov, N. A.; Kantor, E. A.; Musavirov, R. S.; Karakhanov, R. A.; Rakhmankulov, D. L.
Journal of Organic Chemistry USSR (English Translation), 1981 , vol. 17, p. 1576 - 1581
Zhurnal Organicheskoi Khimii, 1981 , vol. 17, # 8 p. 1762 - 1767
Ibatullin, U. G.; Pavlov, Yu. V.; Safarov, M. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1989 , vol. 25, # 10 p. 1107 - 1109
Khimiya Geterotsiklicheskikh Soedinenii, 1989 , # 10 p. 1326 - 1328