Fourie, Niel; Bastianello, Stella S.; Nel, P.W.; Kellerman, T. Stephanus(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
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)
Bastianello, Stella S.; Fourie, Niel; Nel, P.W.; Kellerman, T. Stephanus(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1995)