?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Gottwald%2C+Frank&rft.aulast=Gottwald&rft.aufirst=Frank&rft.date=2005&rft.title=Die+Bedeutung+von+S%C3%83%C2%A4umen+im+gro%C3%83%C2%9Ffl%C3%83%C2%A4chigen+%C3%83%C2%96kologischen+Landbau&rft.genre=proceeding