Giovanni Turi A Context-Aware Location Service for Metropolitan Ad Hoc Networks. 823-828 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2775&spage=823 2003 conf/ifip6-8/2003 PWC db/conf/ifip6-8/pwc2003.html#Turi03