?url_ver=Z39.88-2004&rft_id=10.1021%2Fac026328n&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Asher%2C+SA&rft.aulast=Asher&rft.aufirst=SA&rft.issue=7&rft.volume=75&rft.date=1+April+2003&rft.issn=0003-2700&rft.atitle=Photonic+crystal+aqueous+metal+cation+sensing+materials&rft.title=Analytical+Chemistry&rft.pages=1676+-+1683&rft.genre=article