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Samsoniya, Sh. A. Esakiya, N. A. Suvorov, N. N. Chemistry of Heterocyclic Compounds (New York, NY, United States), 99 , vol. 27, # 4 p. 366 - 369 Khimiya Geterotsiklicheskikh Soedinenii, 99 , # 4 p. 464 - 467