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参考文献
Krauze, A. A.; Liepin'sh, E. E.; Dubur, G. Ya. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1987 , vol. 23, # 4 p. 472 - 473 Khimiya Geterotsiklicheskikh Soedinenii, 1987 , # 4 p. 563 - 564
Krauze, A. A.; Liepin'sh, E. E.; Dubur, G. Ya. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1987 , vol. 23, # 4 p. 472 - 473 Khimiya Geterotsiklicheskikh Soedinenii, 1987 , # 4 p. 563 - 564