Suboch, G. A.; Kuznetsova, G. N.; Semichenko, E. S.; Belyaev, E. Yu.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 4 p. 420 - 421
Khimiya Geterotsiklicheskikh Soedinenii, 1983 , # 4 p. 514 - 515