5Accuracy (trueness and precision) of measurement methods and results. Part 2: basic method for the determination of repeatability and reproducibility of a standard measurement method. ISO 5725-2 . 1994
6CNAS.GL02Guidance on Statistic Treatment of Proficiency Testing Results and Performance Evaluation[]..2006
7.Requirements for Measurement Trac-eability[].CNAS—CL:.
8.AccreditationCriteria for the Competence of Testing and Calibration Lab-oratories[].CNAS—CL: (ISO/IEC :).
9.Accreditation Criteria for the Compet-ence of Reference Material Producers[].CNAS—CL:.
