1. ISO GUM (1993) Guide to the expression of uncertainty in measurement. International Organization for Standardization, Geneva
2. EURACHEM/CITAC (2000) Quantifying uncertainty in analytical measurement, 2nd edn. LGC, Teddington
3. International Vocabulary of Basic and General Terms in Metrology (VIM), 3rd edn, Draft April 2004
4. ISO-9000 (2000) International Standard, 2nd edn. International Standardization Organization, Geneva
5. Heydorn K, Nørgaard K (1973) Talanta 20:835–842