Risk factors for the introduction of bovine viral diarrhea virus in the context of a mandatory control program in Dutch dairy herds by P.I.H. Bisschop, E.E.C. Strous, H.W.F. Waldeck, L. van Duijn, M.H. Mars, I.M.G.A. Santman-Berends, P. Wever, G. van Schaik

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