Kroeze, J.H. (Jan Hendrik); Bothma, T.J.D. (Theodorus Jan Daniel); Matthee, Machdel C.(Vaal Triangle Faculty of Northwest University in South Africa, 2010-07)
Kroeze, J.H. (Jan Hendrik); Matthee, Machdel C.; Bothma, T.J.D. (Theodorus Jan Daniel)(Department of Knowledge and Information Management, University of Johannesburg, 2004-12)