Tim Kindberg Kan Zhang Validating and Securing Spontaneous Associations between Wireless Devices. 44-53 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2851&spage=44 2003 conf/isw/2003 ISC db/conf/isw/isc2003.html#KindbergZ03