Baltrushis, R. S.; Beresnevichyus, Z.-I. G.; Vizgaitis, I. M.; Gatilov, Yu. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 9 p. 1016 - 1021
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , # 9 p. 1267 - 1272