Oleinik, A.F.; Solov'eva, N.P.; Turchin, K.F.; Sheinker, Yu.N.; Novitskii, K.Yu.; et al.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1980 , vol. 16, # 4 p. 334 - 338
Khimiya Geterotsiklicheskikh Soedinenii, 1980 , vol. 16, # 4 p. 450 - 454