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Chemistry of Heterocyclic Compounds (New York, NY, United States), 1990 , vol. 26, # 9 p. 984 - 987
Khimiya Geterotsiklicheskikh Soedinenii, 1990 , # 9 p. 1181 - 1184

Mamedov, E. I.; Ismailov, A. G.; Ibragimov, V. G.; Goyushov, R. D.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 11 p. 1243
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , # 11 p. 1561