Elokhina, V. N.; Nakhmanovich, A. S.; Karnaukhova, R. V.; Kalikhman, I. D.; Bannikova, O. B.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 8 p. 862 - 865
Khimiya Geterotsiklicheskikh Soedinenii, 1984 , vol. 20, # 8 p. 1062 - 1065