1. Eurachem, The fitness for purpose of analytical methods, LGC, Teddington, Middlesex, UK, 1998 (http://www.eurachem.org/guides/valid.pdf).
2. IUPAC, IUPAC Compendium of Analytical Nomenclature, IUPAC Secretariat, Research Triangle Park, NC, USA, 1997 (http://www.iupac.org/publications/analytical_compendium/).
3. International Organization for Standardization, IEC Guide 99, International vocabulary of basic and general terms in metrology (VIM), ISO, Geneva, Switzerland, 2007.
4. International Conference on Harmonisation, Topic Q2B, Validation of Analytical Methods: Methodology. The Third International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use, (ICH) Yokohama, Japan, 29 November–1 December, 1996.
5. Harmonized guidelines for internal quality control in analytical chemistry laboratories (Technical Report)