?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=K&rft.au=Mazvimavi%2C+K&rft.aulast=Mazvimavi&rft.date=2011&rft.title=Conservation+Agriculture+practices+and+challenges+in+Zimbabwe&rft.genre=proceeding