Levshin, I. B.; Chistyakov, V. V.; Pol'shakov, V. I.; Sheinker, Yu. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1987 , vol. 23, p. 910 - 914
Khimiya Geterotsiklicheskikh Soedinenii, 1987 , # 8 p. 1135 - 1140

Levshin, I. B.; Chistyakov, V. V.; Pol'shakov, V. I.; Sheinker, Yu. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1987 , vol. 23, p. 910 - 914
Khimiya Geterotsiklicheskikh Soedinenii, 1987 , # 8 p. 1135 - 1140