Grinev, A. N.; Mezentseva, M. V.; Kuleshova, E. F.; Alekseva, L. M. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1986 , vol. 22, # 5 p. 499 - 503 Khimiya Geterotsiklicheskikh Soedinenii, 1986 , vol. 22, # 5 p. 612 - 615