5Miller G L. Tantalum and Niobium: London.. Butterworths Scientific Publications, 1959. 17.
6Editorial Board of AHandbook for Extractive Metallurgy of Nonferrous Metals(有色金属提取冶金手册编辑委员会编).AHandbook for Extractive Metallurgy of Nonferrous Metals(有色金属提取冶金手册).Bering:Metallurgical Industry Press(北京:冶金工业出版社),1999.157.
7Gupta C K, Suri A K. Extractive Metallurgy Of Niobium. London.. CRC Press, 1994. 98.
8XUEMei(薛梅).稀有金属与硬质合金,2005,33(4):56-56.
9The Editorial Department of Spectroscopy and Spectral Analysis(光谱学与光谱分析编辑部编).TheApplied Technique of ICP Spectral Analysis(ICP光谱分析应用技术).Beijing:Peking University Press(北京:北京大学出版社),1982.