Brigitte Safar Hassen Kefi Chantal Reynaud OntoRefiner, a user query refinement interface usable for Semantic Web Portals. 2004 conf/ecai/2004sw ECAI Workshop on Application of Semantic Web Technologies to Web Communities http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS/Vol-107/paper5.pdf db/conf/ecai/ecaisw2004.html#SafarKR04