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3. ISO/IEC 17043 (2023) Conformity assessment—General requirements for the competence of proficiency testing providers. International Organization for Standardization, Geneva
4. ISO 17034 (2016) General requirements for the competence of reference material producers. International Organization for Standardization, Geneva
5. ISO/IEC 17025 (2017) General requirements for the competence of testing and calibration laboratories. International Organization for Standardization, Geneva