1. Thompson M, Wood R (1993) Pure Appl Chem 65(9):2123–2144
2. Thompson M, Ellison SLR, Wood R (2006) Pure Appl Chem 78(1):145–196
3. ISO 13528:2005 (2005) Statistical methods for use in proficiency testing by interlaboratory comparisons
4. ISO/IEC Guide 43 (1997) Proficiency testing by interlaboratory comparisons. Part 1: development and operation of proficiency testing schemes. Part 2: selection and use of proficiency testing schemes by laboratory accreditation bodies
5. ILAC G13 (2000) Guidelines for the requirements for the competence of providers of proficiency testing schemes