Ngeranwa, J.J.N.; Shompole, S.P.; Venter, Estelle Hildegard; Wambugu, A.; Crafford, Jan Ernst; Penzhorn, Barend Louis(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2008-09)
Huchzermeyer, Fritz W.; Wallace, David Brian; Putterill, John Fraser; Gerdes, Truuske G.H.(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2009)