?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Knuthsen%2C+Pia&rft.aulast=Knuthsen&rft.aufirst=Pia&rft.title=OrgTrace+%E2%80%93+No+Difference+in+Levels+of+Bioactive+Compounds+found+in+Crops+from+Selected+Organic+and+Conventional+Cultivation+Systems&rft.date=May+2011&rft.genre=proceeding