?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Bachinger%2C+Dr.+Johann&rft.aulast=Bachinger&rft.aufirst=Johann&rft.date=2006&rft.title=Ecological+and+agronomic+evaluation+of+crop+rotations+in+organic+farming+systems&rft.genre=proceeding