参考文献

Voronkov,M.G.; Zelchan,G.I. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1969 , vol. 5, # 1 p. 34 - 38 Khimiya Geterotsiklicheskikh Soedinenii, 1969 , vol. 5, # 1 p. 43 - 48