Ukrainets, I. V.; Taran, S. G.; Gorokhova, O. V.; Marusenko, N. A.; Kovalenko, S. N.; et al. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1995 , vol. 31, # 2 p. 167 - 175 Khimiya Geterotsiklicheskikh Soedinenii, 1995 , # 2 p. 195 - 203