?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=N+van&rft.au=Duivenbooden%2C+N+van&rft.aulast=Duivenbooden&rft.atitle=Impact+of+climate+change+on+agricultural+production+in+the+Sahel+%E2%80%93+Part+2.+Case+study+for+groundnut+and+cowpea+in+Niger&rft.title=Climatic+Change&rft.issn=0165-0009&rft.date=2002&rft.volume=54&rft.pages=349-368&rft.issue=3&rft.genre=article