?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=X&rft.au=Liu%2C+X&rft.aulast=Liu&rft.atitle=Nonsequential+double+ionization+with+few-cycle+laser+pulses&rft.volume=92&rft.date=2+April+2004&rft.issue=13&rft.title=PHYS+REV+LETT&rft.issn=0031-9007&rft.genre=article