?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=J+Ph&rft.au=Van+Staveren%2C+J+Ph&rft.aulast=Van+Staveren&rft.atitle=Adaptation+to+toposequence+land+types+in+West+Africa+of+different+sorghum+genotypes+in+comparison+with+local+cultivars+of+sorghum%2C+millet%2C+and+maize&rft.title=Field+Crops+Research&rft.date=1985&rft.volume=11&rft.pages=13-35&rft.genre=article