Rui Amaral Isabel Trancoso Topic Indexing of TV Broadcast News Programs. 219-226 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2721&spage=219 2003 conf/propor/2003 PROPOR db/conf/propor/propor2003.html#AmaralT03