Jouni K. Seppänen Ella Bingham Heikki Mannila A Simple Algorithm for Topic Identification in 0-1 Data. 423-434 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2838&spage=423 2003 conf/pkdd/2003 PKDD db/conf/pkdd/pkdd2003.html#SeppanenBM03