Davy Preuveneers Jan Van den Bergh Dennis Wagelaar Andy Georges Peter Rigole Tim Clerckx Yolande Berbers Karin Coninx Viviane Jonckers Koen De Bosschere Towards an Extensible Context Ontology for Ambient Intelligence. 148-159 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3295&spage=148 2004 conf/eusai/2004 EUSAI db/conf/eusai/eusai2004.html#PreuveneersBWGRCBCJB04