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)
Gilchrist, Frances M.C.; Liebenberg, H.; Van der Merwe, Christiaan F.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)
Abu Elzein, E.M.E.; Aitchison, Henry; Al-Afaleq, A.I.; Al-Bashir, A.M.; Ibrahim, A.O.; Housawi, F.M.T.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)