Di Francesco A, Donati M, Cavrini F, Piva S, Cevenini R, Baldelli R
Department of Veterinary Public Health and Animal Pathology, University of Bologna, via Tolara di Spora 50, 40064 Ozzano Emilia, Bologna, Italy.
Vet Rec. 2005 Sep 10;157(11):325-6. doi: 10.1136/vr.157.11.325.