?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Steinshamn%2C+H%C3%83%C2%A5vard&rft.aulast=Steinshamn&rft.aufirst=H%C3%83%C2%A5vard&rft.date=2006&rft.title=Feed+production+on+farms+without+animals+is+not+environmentally+sustainable&rft.genre=proceeding