1. International Standard ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories, International Organization for Standardization, Geneva, 1999.
2. International Standard ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results—General Principles and definitions, International Organization for Standardization, Geneva, 1994.
3. International Standard ISO 5725-4, Accuracy (trueness and precision) of measurement methods and results—Basic methods for the determination of the trueness of a standard measurement method, International Organization for Standardization, Geneva, 1994.
4. International Standard ISO 5725-2. Accuracy (trueness and precision) of measurement methods and results—Basic methods for the determination of the repeatability and reproducibility of a standard measurement method, International Organization for Standardization, Geneva, 1994.
5. International Standard ISO 5725-3, Accuracy (trueness and precision) of measurement methods and results—Intermediate measures of the precision of a standard measurement method, International Organization for Standardization, Geneva, 1994.