?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Halberg%2C+Niels&rft.aulast=Halberg&rft.aufirst=Niels&rft.date=2008&rft.title=Energy+use+and+Green+house+gas+emission+in+organic+agriculture&rft.genre=proceeding