Bosman, Isak de Villiers; De Beer, Koos; Bothma, T.J.D. (Theodorus Jan Daniel)(South African Institute of Computer Scientists and Information Technologists, 2021-07-12)
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)