Parry-Smith P, Czerwinska M, Krudewig C
Division of Veterinary Pathology, Infection and Immunity, School of Clinical Veterinary Science, University of Bristol, Langford House, Langford BS40 5DU.
Vet Rec. 2008 Jun 21;162(25):826-7. doi: 10.1136/vr.162.25.826.