Mamedov, E. I.; Ismailov, A. G.; Ibragimov, V. G.; Bairamov, G. M.
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.; Goyushov, R. D.; Ibragimov, V. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1991 , vol. 27, # 9 p. 947 - 951
Khimiya Geterotsiklicheskikh Soedinenii, 1991 , # 9 p. 1185 - 1189