Bertin Klein Tristan Miller Sandra Zilles Security Issues for Pervasive Personalized Communication Systems. 56-62 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3450&spage=56 2005 conf/spc/2005 SPC db/conf/spc/spc2005.html#KleinMZ05