Buntyakova, N. A.; Taraskin, K. A.; Kharchenko, V. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , p. 142 - 144
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 2 p. 175 - 177