?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=T+W&rft.au=Tsusaka%2C+T+W&rft.aulast=Tsusaka&rft.atitle=The+changes+in+the+effects+of+temperature+and+rainfall+on+cereal+crop+yields+in+Sub-Saharan+Africa%3A+a+country+level+panel+data+study%2C1989+to+2004&rft.title=Environmental+Economics&rft.date=2013&rft.volume=4&rft.pages=70-80&rft.issue=2&rft.genre=article