参考文献
Mitskyavichyus, V. Yu.; Baltrushis, R. S.; Bilinskaite, I. Ch.; Liepin'sh, E. E.; Zolotoyabko, R. M.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1991 , vol. 27, # 9 p. 999 - 1006
Khimiya Geterotsiklicheskikh Soedinenii, 1991 , # 9 p. 1240 - 1247