Zhigang Li Ming-Tan Sun Margaret H. Dunham Yongqiao Xiao Improving the Web Site's Effectiveness by Considering Each Page's Temporal Information. 47-54 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2762&spage=47 2003 conf/waim/2003 WAIM db/conf/waim/waim2003.html#LiSDX03