?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=H%C3%83%C2%B6rning%2C+Prof.+Bernhard&rft.aulast=H%C3%83%C2%B6rning&rft.aufirst=Bernhard&rft.date=2008&rft.title=Comparison+of+Organic+and+Conventional+Beef-Suckler+Farms+in+Germany&rft.genre=proceeding