1. ISO/IEC 17025:2005, General Requirement for the Competence of Testing and Calibrating Laboratories.
2. EA-4/02, Expression of the Uncertainty of Measurement in Calibration (1999).
3. Guide to the Expression of Uncertainty in Measurement, 1st ed., ISO, Geneva (1995).
4. R. Laaneots and O. Mathiesen, An Introduction to Metrology, TUT Press, Tallinn (2006).
5. Guide 99. International Vocabulary of Metrology: Basic and General Concepts and Associated Terms (VIM), 1st ed., ISO/IEC, Geneva (2007).