1. ISO 17025 (2005) General requirements for the competence of testing and calibration laboratories. International Organization for Standardization, Geneva, Switzerland
2. ISO 5725-2 (1994) 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
3. BIPM, IEC, IFCC, ISO, IUPAC, IUAPAP, OIML (1995) Guide to the expression of uncertainty in measurement, ISBN 92-67-10188-9, 2nd edn. International Organization for Standardization, Geneva, Switzerland
4. Cox MG, Desenfant M, Harris PM, Siebert BRL (2003) Accred Qual Assur 8:548–554
5. EA (2003) Guidelines on the expression of uncertainty in quantitative testing. Document EA 4/16, European Co-Operation for Accreditation