?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nachtman%2C+Gra%C3%85%C2%BCyna&rft.aulast=Nachtman&rft.aufirst=Gra%C3%85%C2%BCyna&rft.date=2006&rft.title=%22Economic+results+achieved+by+a+selected+group+of+organic+farms+in+Poland+in+2004%22&rft.genre=proceeding