1. International Conference on Harmonization (ICH), Q2A: Text on validation of analytical procedures, March (1995)
2. International Conference on Harmonization (ICH), Q2B: Validation of analytical procedures: methodology, May (1997)
3. Holcombe H., ed., The fitness for purpose of analytical methods, in A laboratory guide to method validation and related topics (EURACHEM Guide, LGC, Teddington, 1998)
4. Food and Agriculture Organization (FAO) and International Atomic Energy Agency (IAEA), Food and nutrition paper 68: Validation of analytical methods for food control (FAO/UN, Rome, 1998)