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Shkurko, O. P. Kuznetsov, S. A. Denisov, A. Yu. Mamaev, V. P. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1986 , vol. , # 7 p. 763 - 77 Khimiya Geterotsiklicheskikh Soedinenii, 1986 , vol. , # 7 p. 951 - 958