Mushi, E.Z.; Binta, M.G.; Chabo, R.G.; Isa, J.F.W.; Modisa, Lorna A..(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)
Fitzgerald, S.L.; Greyling, J.M.; Bragg, R.R. (Robert Richard)(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)
Tice, G.A.; Bryson, N.R.; Stewart, C.G.; Du Plessis, B.; De Waal, D.T.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)