?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=van+de+Vijver%2C+L.P.L.&rft.aulast=van+de+Vijver&rft.aufirst=L.P.L.&rft.date=2006&rft.title=Contaminants+and+micro-organisms+in+organic+and+conventional+food+products&rft.genre=proceeding