1. International Standard ISO/IEC 17025. 2005(E)-General requirements for the competence of testing and calibration laboratories, ISO: Geneva, Switzerland, 2005.
2. BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML, ISO (VIM; 1993). International Vocabulary of Basic and General Terms in Metrology. ISO: Geneva, 1993.
3. EAL-G12. Traceability of Measuring and Test Equipment to National Standards, 1995.
4. EUR 18405 EN. Metrology in Chemistry and Biology, 1998.
5. The key elements of traceability in chemical measurement: agreed or still under debate?