?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Schmidt%2C+Dr.+Christoph+S&rft.aulast=Schmidt&rft.aufirst=Christoph+S&rft.date=2006&rft.title=Effect+of+organic+and+conventional+crop+production+systems+on+food+quality+and+safety&rft.genre=proceeding