Grant, C.C. (Catharina Cornelia); Biggs, H.C.; Meissner, H.H.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)
Bezuidenhout, A.J. (Abraham Johannes), 1942-; Seegers, Christine D.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)