Blinokhvatov, A. F.; Markovtseva, O. V.; Shlaider, I. A.; Kharchenko, V. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1981 , vol. 17, # 5 p. 469 - 471
Khimiya Geterotsiklicheskikh Soedinenii, 1981 , # 5 p. 640 - 642