by Adams, D.S, Oliver, R.E, Ameghino, E, DeMartini, J.C, Verwoerd, D.W, Houwers, D.J, Waghela, S, Gorham, J.R, Hyllseth, B, Dawson, M, Trigo, F.J, McGurie, T.C
Published in Veterinary record (10.11.1984)