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)
Webster, A.B. (Andrea); Burroughs, R.E.J. (Richard); Laver, Peter N.; Ganswindt, Andre(NISC (Pty) Ltd and Informa UK Limited (trading as Taylor & Francis Group), 2018)