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Kelarev, V. I.; Koshelev, V. N.; Belov, N. V.; Malova, O. V.; Karakhanov, R. A.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1994 , vol. 30, # 2 p. 218 - 221
Khimiya Geterotsiklicheskikh Soedinenii, 1994 , # 2 p. 240 - 243