Hamid Harroud Mohamed Khedr Ahmed Karmouch Building Policy-Based Context Aware Applications for Mobile Environments. 48-61 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3284&spage=48 2004 conf/mata/2004 MATA db/conf/mata/mata2004.html#HarroudKK04