?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Bonde%2C+Marianne&rft.aulast=Bonde&rft.aufirst=Marianne&rft.date=2006&rft.title=Risk+of+Salmonella+shedding+in+different+pig+production+systems&rft.genre=proceeding