Ker, James A.; Webb, E.C. (Edward Cottington); Van Papendorp, D.H. (Dirk Hermanus), 1949-(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2009-12)
Joubert, Annie M.; Van Zyl, Hermia; Laurens, Johannes B.; Lottering, Mona-Liza(Centro Regional de Investigaciones Cientificas Y Tecnologicas / Universidad Nacional de Cuyo, 2009)