1. Anon 2004 Uniform Classification Guidelines for Foreign Substances http://www.arci.com
2. Anon 2009 Article 6. Prohibited Substances 20 23 http://www.Horseracingintfed.com/resources/2009_choose_eng.pdf
3. Caffeine and theobromine identifications in post race urines: Threshold levels and regulatory significance of such identifications;Budhraja;Proc. Am. Ass. equine Practnrs.,2007
4. Review of environmental morphine identifications: worldwide occurrences and responses of authorities;Camargo;Proc. Am. Ass. equine Practnrs.,2005
5. Combined use of detomidine with opiates in the horse;Clarke;Equine. vet. J.,1988