文献:Alekseenko, T. A.; Bazhbeuk-Melikova, T. S.; Zelenskaya, O. V.; Kozinskii, V. A. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1989 , vol. 25, # 11 p. 1299 - 1300 Khimiya Geterotsiklicheskikh Soedinenii, 1989 , # 11 p. 1550 - 1551