?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Fried%2C+Padruot+M.&rft.aulast=Fried&rft.aufirst=Padruot+M.&rft.date=2005&rft.title=How+economic+is+organic%3F+Results+of+a+long-term+trial+at+Burgrain%2FLucerne%2C+Switzerland&rft.genre=proceeding