Schöniger S, Chan D L, Hollinshead M, Humm K, Smith G L, Beard P M
Department of Pathology and Infectious Diseases, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire.
Vet Rec. 2007 Apr 14;160(15):522-3. doi: 10.1136/vr.160.15.522.