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Sadekov, I. D.; Abakarov, G. M.; Shneider, A. A.; Kuren', S. G.; Starikov, A. G.; et al.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1989 , vol. 25, # 1 p. 103 - 108
Khimiya Geterotsiklicheskikh Soedinenii, 1989 , # 1 p. 120 - 125