Grinev, A. N.; Mukhanova, T. I.; Zinov'eva, R. A.; Alekseeva, L. M. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , p. 1044 - 1046 Khimiya Geterotsiklicheskikh Soedinenii, 1983 , vol. 19, # 10 p. 1314 - 1317