1. Regulation (EC) No 882/2004 of the European Parliament and of the Council of 29 April 2004 on official controls performed to ensure the verification of compliance with feed and food law, animal health and animal welfare rules. Off J Eur Union L 165:1–141
2. Council Directive 96/23/EC of 29 April 1996 on measures to monitor certain substances and residues thereof in live animals and animal products. Off J Eur Union L 125:10–32
3. ISO/IEC Guide 43–1 (1997) Proficiency testing by interlaboratory comparisons—part 1: development and operation of proficiency testing schemes. International Organization for Standardisation, Geneva
4. ISO/IEC 17043 (2010) Conformity assessment-General requirements for proficiency testing. International Organization for Standardisation, Geneva
5. Commission Regulation (EC) No 1881/2006 of 19 December 2006 setting maximum levels for certain contaminants in foodstuffs. Off J Eur Union L 364:5–24