Ngwangwa, Harry Magadhlela; Heyns, P.S. (Philippus Stephanus); Labuschagne, F.J.J. (Kobus); Kululanga, Grant K.(SATC, 2008-07)
Paper presented at the 27th Annual Southern African Transport Conference 7 - 11 July 2008 "Partnership for research and progress in transportation", CSIR International Convention Centre, Pretoria, South Africa.
