1. ISO/IEC 17025. Requirements for the quality and competence of calibrating and testing laboratories, 1999.
2. ISO 15189. Medical laboratories—Particular requirements for quality and competence, 2003
3. EURACHEM/CITAC. Quantifying uncertainty in analytical measurement, 2000.
4. Council Directive 77/312/EEC of 29 March 1977 on biological screening of the population for lead. Off J L 105, 28/04/1977, 10–17.