Van Heerden, J.H. (Jan Horn), 1957-; Blignaut, James Nelson; Groenendijk, N.S.(Faculty of Economic and Management Sciences, University of Pretoria, 1999-06)
Janse van Rensburg, Estrelita; Engelbrecht, Susan; Van Heerden, Willem Francois Petrus; Raubenheimer, E.J.; Schoub, Barry D.(International Institute of Anticancer Research, 1995-05)