Stevens, K.B.; Spickett, Arthur M.; Vosloo, Wilna; Pfeiffer, Dirk U.; Dyason, Edwin; Du Plessis, B.(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2007-06)
Cloete, M.; Dungu, B.; Van Staden, L.I.; Ismail-Cassim, N.; Vosloo, Wilna(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2008-03)