?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=T+J&rft.au=Rego%2C+T+J&rft.aulast=Rego&rft.atitle=Long-term+effects+of+grain+legumes+on+rainy-season+sorghum+productivity+in+a+semi-arid+tropical+Vertisol&rft.title=Experimental+Agriculture&rft.date=2000&rft.volume=36&rft.pages=205-221&rft.issue=2&rft.genre=article