Hering-Hagenbeck, S.F.B.N.; Petter, A.J.(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2002)
Takai, S.; Henton, Marijke M.; Fukushi, H.; Sugimoto, C.(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2001)