参考文献

Velezheva, V. S.; Ryabova, S. Yu. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1990 , vol. 26, # 5 p. 520 - 524 Khimiya Geterotsiklicheskikh Soedinenii, 1990 , # 5 p. 617 - 621