?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Willer%2C+Helga&rft.aulast=Willer&rft.aufirst=Helga&rft.date=2008&rft.title=Organic+Viticulture+in+Europe%3A+Development+and+current+statistics+&rft.genre=proceeding