Fourie, Niel; Bastianello, Stella S.; Nel, P.W.; Kellerman, T. Stephanus(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)
Kellerman, T. Stephanus; Erasmus, G.L.; Brown, J.M.M.; Maartens, B.P.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)