Dixon P M, Railton D I, McGorum B C
Department of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Veterinary Field Station, Easter Bush, Roslin, Midlothian, UK.
Equine Vet J. 1994 Mar;26(2):166-70. doi: 10.1111/j.2042-3306.1994.tb04361.x.