Shigeru Oyanagi Kazuto Kubota Akihiko Nakase Mining WWW Access Sequence by Matrix Clustering. 119-136 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2703&spage=119 2002 conf/kdd/2002web WEBKDD db/conf/kdd/webkdd2002.html#OyanagiKN02