Avarzed, A.; De Waal, D.T.; Igarashi, I.; Saito, A.; Oyamada, T.; Toyoda, Y.; Suzuki, N.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1997)
Ohale, L.O.C.(Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2001)