1. ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO, Geneva (Switzerland), 2017)
2. ISO/IEC Guide 98-3, Uncertainty of measurement – Part 3: Guide to the expression of uncertainty in measurement (GUM: 1995) (ISO, Geneva (Switzerland), 2008)
3. ISO 13528, Statistical methods for use in proficiency testing by interlaboratory comparison (ISO, Geneva (Switzerland), 2015)
4. ISO 5725-Part 1 to 6, Accuracy (trueness and precision) of measurement methods and results (ISO, Geneva (Switzerland), 1994)
5. Thompson M., Ellison S., Wood R., The International Harmonized Protocol for the proficiency testing of analytical chemistries laboratories, Pure Appl. Chem.
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, (2006), DOI: 10.1351/pac200678010145