?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Six%2C+Roswitha&rft.aulast=Six&rft.aufirst=Roswitha&rft.date=2006&rft.btitle=Biokartoffeln%3A+Qualit%C3%83%C2%A4t+mit+jedem+Anbauschritt&rft.genre=book