参考文献
Kuznetsov, V. V.; Gaivoronskaya, L. A.; Romero, R. M.; Stashenko, E. E.; Zakharov, P. I.; Prostatkov, N. S.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1987 , vol. 23, # 7 p. 783 - 786
Khimiya Geterotsiklicheskikh Soedinenii, 1987 , # 7 p. 954 - 958