Aixin Sun Ee-Peng Lim Wee Keong Ng Personalized Classification for Keyword-Based Category Profiles. 61-74 2002 conf/ercimdl/2002 ECDL http://link.springer.de/link/service/series/0558/bibs/2458/24580061.htm db/conf/ercimdl/ecdl2002.html#SunLN02