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Pozharskii, A. F.; Gulevskaya, A. V.; Kuz'menko, V. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1988 , vol. 24, # 12 p. 1404 - 1405
Khimiya Geterotsiklicheskikh Soedinenii, 1988 , vol. 24, # 12 p. 1696 - 1697