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Torgashev, P. A.; Kazantseva, I. V.; Chupakhin, O. N.; Charushin, V. N.; Belik, A. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1989 , vol. 25, # 8 p. 936 - 943
Khimiya Geterotsiklicheskikh Soedinenii, 1989 , # 8 p. 1118 - 1125