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2. Chemical Methods of Rock Analysis;Jeffery,1970
3. Flame atomic-emission determination of ultratrace concentrations of alkali metals;Prudnikov;Zh. Anal. Khim. (Russian),1995
4. Direct flame-photometric analysis of powdered materials;Gilbert;Anal. Chem.,1962
5. Direct flame atomic emission determination of trace alkali elements in powdered samples;Prudnikov;Zh. Anal. Khim. (Russian),1990