参考文献

Valter, R. E.; Baumanis, E. A.; Stradynya, L. K.; Liepin'sh, E. E. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1981 , p. 375 - 377 Khimiya Geterotsiklicheskikh Soedinenii, 1981 , vol. 17, # 4 p. 516 - 519