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Khimiya Geterotsiklicheskikh Soedinenii, 1981 , vol. 17, # 3 p. 343 - 346

Ladatko, A. A.; Sadekov, I. D.; Etmetchenko, L. N.; Minkin, V. I.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1989 , vol. 25, # 5 p. 577 - 580
Khimiya Geterotsiklicheskikh Soedinenii, 1989 , # 5 p. 691 - 695