1. Guide to the Expression of Uncertainty in Measurement, International Organization of Standardization (ISO), Geneva, 1993.
2. EURACHEM/CITAC Guide: Quantifying Uncertainty in Analytical Measurement,2000
3. General requirements for the competence of testing and calibration laboratories, ISO/IEC 17025:2000.
4. A large number of very educative examples can be found at the web page of the IMEP intercomparison measurements that are organized by the EC JRC IRMM, http://www.imep.ws/.
5. The practical realization of the traceability of chemical measurements standards