?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=R+B&rft.au=Matthews%2C+R+B&rft.aulast=Matthews&rft.atitle=Response+of+four+sorghum+lines+to+mid-season+drought.+II.+Leaf+characteristics&rft.title=Field+Crops+Research&rft.issn=0378-4290&rft.date=1990&rft.volume=25&rft.pages=297-308&rft.issue=3-4&rft.genre=article