Mukaratirwa, S.; Nkulungo, E.; Matenga, E.; Bhebhe, E.(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2003)
Goldberg, S.R.; Bursey, C.R.(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2001)