?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.cplett.2008.09.002&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Choi%2C+TH&rft.aulast=Choi&rft.aufirst=TH&rft.issue=4-6&rft.volume=464&rft.date=23+October+2008&rft.issn=0009-2614&rft.atitle=Analytical+gradient+for+geometry+optimizations+of+(H%3Cinf%3E2%3C%2Finf%3E+O)%3Cinf%3En%3C%2Finf%3E%3Csup%3E-%3C%2Fsup%3E+clusters+as+described+by+the+PM1+polarizable+model&rft.title=Chemical+Physics+Letters&rft.pages=139+-+143&rft.genre=article