\bibitem{hl05}
Haibin Liu and Vlado Keselj.
\newblock Combined Mining of Web Server Logs and Web Contents for
Classifying User Navigation Patterns and Predicting Users' Future
Requests.
\newblock {\em Data \& Knowledge Engineering,\/} vol.~61,
pp.~304--330, May 2007.
(Published on-line in 2006).