Mynhardt, Herman; Van Niekerk, Willem A.; Erasmus, Lourens Jacobus; Hassen, Abubeker; Coertze, Roelof Johannes(Escola Superior de Agricultura, 2016-11)
Svinurai, Walter; Hassen, Abubeker; Tesfamariam, Eyob Habte; Ramoelo, Abel; Cullen, Brendan(NISC (Pty) Ltd and Informa UK Limited (trading as Taylor & Francis Group), 2021)