Witsberger, Tige H.; Levine, Jonathan M.; Fosgate, Geoffrey Theodore; Slater, Margaret R.; Kerwin, Sharon C.; Russell, Karen E.; Levine, Gwendolyn J.(American Veterinary Medical Association, 2012-03-01)
Petzer, Inge-Marie; Karzis, Joanne; Van der Schans, Theodorus J.; Watermeyer, Johanna C.; Mitchell-Innes, Norman; Eloff, Stephanie; Fosgate, Geoffrey Theodore(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2012-02-10)