Shustov, G. V.; Tavakalyan, N. B.; Pleshkova, A. P.; Kostyanovskii, R. G.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1981 , vol. 17, # 6 p. 600 - 605
Khimiya Geterotsiklicheskikh Soedinenii, 1981 , # 6 p. 810 - 815