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Shvekhgeimer, G. A.; Kelarev, V. I.; Dyankova, L. A.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 12 p. 1324 - 1330
Khimiya Geterotsiklicheskikh Soedinenii, 1984 , # 12 p. 1609 - 1615