Wenhold, Friedeburg Anna Maria; Faber, Mieke; Van Averbeke, W.; Oelofse, Andre; Van Jaarsveld, P.; Jansen van Rensburg, W.S.; Van Heerden, I.; Slabbert, R.(Water Research Council, 2007-06)
Kruger, Cornelius Johannes; Snyman, M.M.M. (Maria Magdalena Margaretha)(Department of Knowledge and Information Management, University of Johannesburg, 2007-09)