?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=D+A&rft.au=Hoisington%2C+D+A&rft.aulast=Hoisington&rft.atitle=Plant+genetic+resources%3A+What+can+they+contribute+toward+increased+crop+productivity%3F+&rft.title=Proceedings+of+the+National+Academy+of+Sciences&rft.issn=1091-6490&rft.date=1999&rft.volume=96&rft.pages=5937-5943&rft.issue=11&rft.genre=article