?url_ver=Z39.88-2004&rft_id=10.1016%2F0169-5150(90)90006-M&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=B+W&rft.au=Brorsen%2C+B+W&rft.aulast=Brorsen&rft.atitle=A+test+of+whether+millet+acreage+in+Niger+is+determined+by+official+or+private+market+prices&rft.title=Agricultural+Economics&rft.issn=01695150&rft.date=1990&rft.volume=04&rft.pages=287-296&rft.issue=3-4&rft.genre=article