?url_ver=Z39.88-2004&rft_id=10.1073%2Fpnas.1610359113&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=M+K&rft.au=van+Ittersum%2C+M+K&rft.aulast=van+Ittersum&rft.atitle=Can+sub-Saharan+Africa+feed+itself%3F&rft.title=Proceedings+of+the+National+Academy+of+Sciences&rft.issn=0027-8424&rft.date=2016&rft.volume=113&rft.pages=14964-14969&rft.issue=52&rft.genre=article