Krapivin, G. D.; Kul'nevich, V. G.; Val'ter, N. I.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1986 , vol. 22, # 10 p. 1072 - 1075
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Krapivin, G. D.; Val'ter, N. I.; Zavodnik, V. E.; Kaklyugina, T. Ya.; Kul'nevich, V. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1994 , vol. 30, # 3 p. 296 - 304
Khimiya Geterotsiklicheskikh Soedinenii, 1994 , # 3 p. 335 - 344