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)
Smith, Marie F.; Leighton, Christine S. (Christina Stephanie); Morey, Liesl; Schonfeldt, H.C. (Hettie Carina)(South African Society of Crop Production/ Soil Science Society of South Africa/ South African Weed Science Society/ South African Society for Horticultural Sciences, 2009-01)
Malleson, Evelyn Rhoda; Meeske, R.; Erasmus, Lourens Jacobus; Van Niekerk, Willem A.; Coertze, Roelof Johannes(Tropical Grassland Society of Australia, 2009)