Van Aswegen, G.; Schoeman, J.H.; De Vos, Valerius; Van Noorden, Susan(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
Kellerman, T. Stephanus; Maartens, B.P.; Schultz, R.A. (Rowena Anitra); Swart, D. Petro(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
Van Amstel, S.R.; Reyers, Fred; Myburgh, Elsbe; Pretorius, Gertruida; Sacks, P.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
Miles, Christopher O.; Wilkins, A.L.; Erasmus, G.L.; Kellerman, T. Stephanus(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)