?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Singh%2C+M&rft.aufirst=M&rft.aulast=Singh&rft.issn=0963-6420&rft.pages=44-50&rft.atitle=Plant-parasitic+nematode+densities+in+cereal+and+legume+based+cropping+systems+on+vertisols&rft.volume=4&rft.issue=1&rft.title=Afro-Asian+Journal+of+Nematology&rft.date=1994&rft.genre=article