1. EC. Directive 2001/82/EC of the European Parliament and of the Council of 6 November 2001 on the Community code relating to veterinary medicinal products. (Official Journal L 311, 28/11/2001 p. 1 - 66). (consolidated version: 18/7/2009). 2001 [http://ec.europa.eu/health/documents/eudralex/vol-5/index_en.htm].
2. EC. Directive 2004/28/EC of the European Parliament and of the Council of 31 March 2004 amending Directive 2001/82/EC on the Community code relating to veterinary medicinal products (Official Journal L 136, 30/4/2004 p. 58 - 84). 2004 [http://ec.europa.eu/health/documents/eudralex/vol-5/index_en.htm].
3. EU. Comission Regulation (EU) No 37/2010 of 22 December 2009 on pharmacologically active substances and their classification regarding maximum residue limits in foodstuffs of animal origin Official Journal of the European Union L 15/1 II. 2010 [http://ec.europa.eu/health/files/eudralex/vol-5/reg_2010_37/reg_2010_37_en.pdf].
4. Heinonen ML, Raekallio MR, Oliviero C, Ahokas S, Peltoniemi OA. Comparison of azaperone-detomidine-butorphanol-ketamine and azaperone-tiletamine-zolazepam for anaesthesia in piglets. Vet Anaesth Analg. 2009;36:151–7.
5. Malavasi LM, Jensen-Waern M, Jacobson M, Ryden A, Ohagen P, Nyman G. Effects of extradural morphine on end-tidal isoflurane concentration and physiological variables in pigs undergoing abdominal surgery: a clinical study. Vet Anaesth Analg. 2006;33:307–12.