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Vinokurov, V. G.; Zykov, D. A.; Kirsanova, Z. D.; Rozenberg, S. G.; Troitskaya, V. S.; et al.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1991 , vol. 27, # 3 p. 288 - 291
Khimiya Geterotsiklicheskikh Soedinenii, 1991 , # 3 p. 355 - 359