Afanas'eva, G. B.; Vysokov, V. I.; Pashkevich, T. K.; Chupakhin, O. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , p. 174 - 177
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 2 p. 214 - 218