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2. COMAR 2017 International database for certified reference materials http://www.comar.bam.de
3. General Administration of Quality Supervision, Inspection and Quarantine (China) 2010a GB/T 14352.1-2010: Methods for chemical analysis of tungsten ores and molybdenum ores - Part 1: Determination of tungsten content Standards Press of China Beijing 4pp
4. General Administration of Quality Supervision, Inspection and Quarantine (China) 2010b GB/T 14352.2-2010: Methods for chemical analysis of tungsten ores and molybdenum ores - Part 2: Determination of molybdenum content Standards Press of China Beijing 5pp