Abu Elzein, E.M.E.; Hilali, M.; Al-Afaleq, A.I.; Mellor, Philip S.; Boorman, J.; Al-Atiya, S.; Al-Naiem, A.
(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2002)