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Azev, Yu. A.; Loginova, I. P.; Golomolzin, B. V.; Mudretsova, I. I.; Rusinov, V. L.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1990 , vol. 26, # 1 p. 118 - 119
Khimiya Geterotsiklicheskikh Soedinenii, 1990 , vol. 26, # 1 p. 135 - 136