?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=L&rft.au=Hallgren%2C+L&rft.aulast=Hallgren&rft.atitle=A+screening+test+for+grain+hardness+in+sorghum+employing+density+grading+in+sodium+nitrate+solution&rft.title=Journal+of+Cereal+Science&rft.date=1983&rft.volume=1&rft.pages=265-274&rft.issue=4&rft.genre=article