1. Ingerslev F, Vaclavik E, Halling-Sørensen B (2003) Pure Appl Chem 75:1881–1893
2. EC (1996) Council Directive (96/22/EC) of 29 April 1996 concerning the prohibition on the use in stockfarming of certain substances, having a hormonal or thyrostatic action and of betaagonists, and repealing Directives 81/602/EEC, 88/146/EEC and 88/299/EEC. Off J Eur Commun L125:3–9
3. EC (2003) Council Directive (2003/74/EC) of 22 September 2003 concerning the prohibition on the use in stockfarming of certain substances having a hormonal or thyrostatic action and of beta-agonists, amending Council Directive 96/22/EC. Off J Eur Commun L262:17–21
4. EC (1996) Council Directive (96/23/EC) of 29 April 1996 on measures to monitor certain substances and residues thereof in live animals and animal products and repealing Directives 85/358/EEC and 86/469/EEC and Decision 89/187/EEC and 91/664/EEC. Off J Eur Commun L125:10–31
5. Jondorf WR, Macdougall DF (1977) Vet Rec 100:560–562