Mironova, G. A.; Kirillova, E. N.; Kuklin, V. N.; Smorygo, N. A.; Ivin, B. A.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 10 p. 1088 - 1094
Khimiya Geterotsiklicheskikh Soedinenii, 1984 , vol. 20, # 10 p. 1328 - 1334