1. Brookman, B., Mann, I., (eds.): Eurachem Guide: Selection, Use and Interpretation of Proficiency Testing (PT) Schemes (3rd ed. 2021). Available from www.eurachem.org
2. ISO 13528: Statistical methods for use in proficiency testing by interlaboratory comparison. International Organization for Standardization, Geneva, Switzerland (2022)
3. ISO/IEC 17043: Conformity Assessment—General requirements for the competence of proficiency testing providers. International Organization for Standardization, Geneva, Switzerland (2023)
4. ISO 5725–2: Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method. International Organization for Standardization, Geneva, Switzerland (2019)
5. ISO 5725–5: Accuracy (trueness and precision) of measurement methods and results Part 5: Alternative methods for the determination of the precision of a standard measurement method International Organization for Standardization, Geneva, Switzerland (1998)