Steyl, Johan Christian Abraham; Prozesky, Leon; Stoltsz, Wilhelm Heinrich(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2012-04-20)
Long, Channen; Tordiffe, Adrian Stephen Wolferstan; Sauther, Michelle; Cuozzo, Frank P.; Millette, James; Ganswindt, Andre; Scheun, Juan(Oxford University Press, 2021-10)