Idowu, O.A.; Lorentz, Simon A.; Annandale, John George; Aken, Mark Ernest; McCartney, M.P.; Thornton-Dibb, S.L.C.; Westhuizen, A.(Water Research Council, 2010-10)
Van der Laan, Michael; Annandale, John George; Du Preez, C.C.; Lorentz, Simon A.(South African Society of Crop Production/ Soil Science Society of South Africa/ Southern African Weed Science Society/ Southern African Society for Horticultural Sciences, 2009)