by Guthrie, A J, Howell, P G, Gardner, I A, Swanepoel, R E, Nurton, J P, Harper, C K, Pardini, A, Groenewald, D, Visage, C W, Hedges, J F, Balasuriya, U B, Cornel, A J, MacLachlan, N J
Published in Equine veterinary journal (01.09.2003)

by Howell, P.G. (Pretoria Univ., Onderstepoort (South Africa). Equine Research Centre), Groenewald, D, Visage, C.W, Bosman, A.-M, Coetzer, J.A.W, Guthrie, A.J
Published in Onderstepoort journal of veterinary research (01.03.2002)