参考文献

Burova, O. A.; Smirnova, N. M.; Safonova, T. S. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1990 , vol. 26, # 6 p. 677 - 680 Khimiya Geterotsiklicheskikh Soedinenii, 1990 , # 6 p. 811 - 814