参考文献

Schaefer, H.; Gewald, K.; Schmidt, M. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1983 , vol. 19, # 11 p. 1163 - 1166 Khimiya Geterotsiklicheskikh Soedinenii, 1983 , # 11 p. 1471 - 1475