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Orlov, V. D.; Desenko, S. M.; Kolos, N. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 1 p. 106 - 111
Khimiya Geterotsiklicheskikh Soedinenii, 1984 , vol. 20, p. 126 - 131