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Slavinskaya, V. A.; Sile, D. E.; Katkevich, M. Yu.; Korchagova, E. Kh.; Lukevits, E.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1994 , vol. 30, # 6 p. 724 - 728
Khimiya Geterotsiklicheskikh Soedinenii, 1994 , # 6 p. 829 - 833