?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=T+K&rft.au=Das%2C+T+K&rft.aulast=Das&rft.atitle=Density-effect+and+economic+threshold+of+purple+nutsedge+(Cyperus+rotundus)+in+soybean&rft.title=Journal+of+Pest+Science&rft.issn=1612-4766&rft.date=2013&rft.pages=1-10&rft.genre=article