?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=M+V+K&rft.au=Sivakumar%2C+M+V+K&rft.aulast=Sivakumar&rft.date=1983&rft.title=Potential+Agricultural+Productivity+in+Summer+and+Winter+Rainfall+Areas&rft.genre=proceeding