Mushi, E.Z.; Binta, M.G.; Chabo, R.G.; Hyera, J.M.K.; Thibanyane, K.M.; Mkaria, J.(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)