?url_ver=Z39.88-2004&rft_id=Plant+Stress+5&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=P&rft.au=Ratnakumar%2C+P&rft.aulast=Ratnakumar&rft.atitle=Semi-arid+Crop+Responses+to+Atmospheric+Elevated+CO2+&rft.title=Plant+Stress(+Special+Issue1)&rft.issn=1749-0359&rft.date=2011&rft.pages=42-51&rft.genre=article