?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Cravens&rft.au=Cravens%2C+TE&rft.aufirst=TE&rft.issue=12&rft.title=Geophysical+Research+Letters&rft.issn=0094-8276&rft.date=25+June+2005&rft.atitle=Titan's+ionosphere%3A+Model+comparisons+with+Cassini+Ta+Data&rft.volume=32&rft.genre=article