Eremeev, A. V.; Piskunova, I. P.; El'kinson, R. S.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1986 , vol. 22, # 2 p. 227 - 228
Khimiya Geterotsiklicheskikh Soedinenii, 1986 , vol. 22, # 2 p. 277 - 278

Eremeev, A. V.; Piskunova, I. P.; El'kinson, R. S.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1985 , vol. 21, # 8 p. 998 - 1002
Khimiya Geterotsiklicheskikh Soedinenii, 1985 , vol. 21, # 8 p. 1202 - 1206