?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Macarena&rft.aulast=Mata&rft.au=Mata%2C+Macarena&rft.title=Policy-relevant+research+and+integrative+indicators+in+the+conversion+to+organic+farming&rft.date=2002&rft.genre=proceeding