Fatos Xhafa Santi Caballé Thanasis Daradoumis Nan Zhou A Grid-Based Approach for Processing Group Activity Log Files. 175-186 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3292&spage=175 2004 conf/otm/2004 OTM Workshops db/conf/otm/otm2004.html#XhafaCDZ04