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Dulenko, V. I.; Golyak, V. M.; Alekseev, N. N.; Cubar, V. I.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 7 p. 723 - 724
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 7 p. 904 - 905