?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Knickel%2C+Dr+Karlheinz&rft.aulast=Knickel&rft.aufirst=Karlheinz&rft.date=2006&rft.title=Strengthening+the+positive+links+between+organic+farming+and+a+sustainable+development+of+rural+areas&rft.genre=proceeding