Seixas F, Travassos P, Pinto M L, Pires I, Pires M A
Department of Veterinary Sciences, Centre for Studies on Agricultural and Veterinary Sciences, University of Trás-os-Montes e Alto Douro, Apartado 1013, 5000-911 Vila Real, Portugal.
Vet Rec. 2006 Feb 25;158(8):274-5. doi: 10.1136/vr.158.8.274.