Bingham, J.; Foggin, Chris M.; Wandeler, A.I. (Alexander I.); Hill, F.W.G.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)
Mushi, E.Z.; Binta, M.G.; Chabo, R.G.; Mathaio, M.; Ndebele, R.T.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)