?url_ver=Z39.88-2004&rft_id=doi%3A10.1109%2FWIIAT.2008.180&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Le%2C+Dieu+Thu&rft.aulast=Le&rft.aufirst=Dieu+Thu&rft.date=9+December+2008&rft.title=Matching+and+Ranking+with+Hidden+Topics+towards+Online+Contextual+Advertising&rft.btitle=2008+IEEE%2FWIC%2FACM+International+Conference+on+Web+Intelligence+and+Intelligent+Agent+Technology&rft.genre=proceeding