Muminov, A.; Yudin, L. G.; Zinchenko, E. Ya.; Romanova, N. N.; Kost, A. N. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1985 , vol. 21, # 9 p. 1012 - 1015 Khimiya Geterotsiklicheskikh Soedinenii, 1985 , vol. 21, # 9 p. 1218 - 1221