Prostakov, N. S.; Habib, Hanna Bu; Kirillova, L. N.; Sorokin, O. I.; Varlamov, A. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 7 p. 778 - 781
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 7 p. 967 - 970