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)
Petzer, Inge-Marie; Donkin, Edward Francis; Du Preez, E.; Karzis, Joanne; Van der Schans, Theodorus J.; Watermeyer, Johanna C.; Van Reenen, R.(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2008-06)