Schultz, R.A. (Rowena Anitra); Fourie, Niel; Basson, Karin M.; Labuschagne, Leonie(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2001)
Sahle, M.; Burgess, W.G.; Kidanemariam, Awoke(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2002)