Bezuidenhout, A.J. (Abraham Johannes), 1942-; Burger, W.P.; Reyers, Fred(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
Fourie, Niel; Kellerman, T. Stephanus; Cornelius, S.T.; Ward, Caroline; Van der Lugt, Jaco J.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)