?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Willer%2C+Helga&rft.aufirst=Helga&rft.aulast=Willer&rft.date=2003&rft.title=The+European+Project+and+Literature+Database+for+Organic+Farming+Research&rft.genre=proceeding