Dieter Hutter Werner Stephan Markus Ullmann Security and Privacy in Pervasive Computing State of the Art and Future Directions. 285-289 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2802&spage=285 2003 conf/spc/2003 SPC db/conf/spc/spc2003.html#HutterSU03