Olwoch, Jane Mukarugwiza; Van Jaarsveld, A.S.; Scholtz, Clarke H.; Horak, Ivan Gerard(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2007-03)
Horak, Ivan Gerard; Nyangiwe, Nkululeko; De Matos, Carlos Antonio; Neves, L.C.B.G.D. (Luís)(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2009-02)