Moskalev, N. V.; Sirotkina, E. E.; Ogorodnikov, V. D. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1985 , vol. 21, # 5 p. 542 - 543 Khimiya Geterotsiklicheskikh Soedinenii, 1985 , vol. 21, # 5 p. 644 - 645