1. Emons H, Linsinger TPJ, Gawlik BM (2004) Trends Anal Chem 23:442–449
2. BIPM-IEC-IFCC-ISO-IUPAC-IUPAP-OIML (1993) International Vocabulary of Basic and General Terms in Metrology (VIM), 2nd edition, ISO, Geneva
3. International Organization for Standardization (2005) ISO Guide 35: Reference Materials – General and statistical principles for certification, 3rd edition, ISO, Geneva
4. International Organization for Standardization (2000) ISO Guide 31: Reference Materials – Contents of certificates and labels, 2nd edition, ISO, Geneva
5. International Organization for Standardization (2000) ISO Guide 34: General requirements for the competence of reference material producers, 2nd edition, ISO, Geneva