?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Huhtala%2C+Anni&rft.aulast=Huhtala&rft.aufirst=Anni&rft.date=2005&rft.title=Environmental+targets+and+shadow+prices+of+bad+outputs+in+organic+and+conventional+farming&rft.genre=proceeding