Spickett, Arthur M.; Burger, D.B.; Crause, J.C.; Roux, Elizabeth M.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Kellerman, T. Stephanus; Schultz, R.A. (Rowena Anitra); Rabie, C.J.; Van Ark, H.; Maartens, B.P.; Lubben, Annelie(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Scholtz, M.M.; Spickett, Arthur M.; Lombard, P.E.; Enslin, C.B.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)