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Survey of infectious agents involved in acute respiratory disease in finishing pigsLoeffen, W. L. A.; Kamp, E. M.; Stockhofe-Zurwieden, N.; Van Nieuwstadt, A. P. K. M. I.; Bongers, J. H.; Hunneman, W. A.; Elbers, A. R. W.; Baars, J.; Nell, T.; Van Zijderveld, F. G. · Veterinary Record · 1999