1. De Bièvre P (2007) Accred Qual Assur 12:279–281
2. ISO/IEC Guide 99 (2007) International vocabulary of metrology—Basic and general concepts and associated terms (VIM), 3rd edn. International Organization for Standardization, Geneva
3. ISO (1995) Guide to the expression of uncertainty in measurement (GUM). International Organization for Standardization, Geneva
4. Ehrlich C, Dybkaer R, Wöger W (2007) Accred Qual Assur 12:201–218
5. ISO 13528 (2005) Statistical methods for use in proficiency testing by interlaboratory comparisons. International Organization for Standardization, Geneva