Seongoun Hwang Kisong Yoon Privacy Protection in Ubiquitous Computing Based on Privacy Label and Information Flow. 46-54 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3044&spage=46 2004 conf/iccsa/2004-2 ICCSA (2) db/conf/iccsa/iccsa2004-2.html#HwangY04