?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=R&rft.au=Tabo%2C+R&rft.aulast=Tabo&rft.atitle=Effect+Of+Plant+Population+Density+On+The+Growth+And+Yield+Of+Sorghum+Varieties+Grown+On+A+Vertisol&rft.title=African+Crop+Science+Journal&rft.issn=1021-9730&rft.date=2002&rft.volume=10&rft.pages=31-38&rft.issue=1&rft.genre=article