参考文献

Kazymov,A.V.; Shchelkina,E.P. Chemistry of Heterocyclic Compounds (New York, NY, United States), 1971 , vol. 7, p. 1287 - 1290 Khimiya Geterotsiklicheskikh Soedinenii, 1971 , vol. 7, # 10 p. 1378 - 1381