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2. Logic and diagnosis;Clendening,1947
3. The laboratory in clinical medicine;Halsted,1976
4. Bovine viral diarrhea virus (BVDV) 1b: predominant BVDV subtype in calves with respiratory disease;Fulton;Can J Vet Res,2002
5. Bovine viral diarrhoea virus antigenic diversity: impact on disease and vaccination programmes;Fulton;Biologicals,2003