Zaheer Osman Martin Maguire Mikko Tarkiainen Older Users' Requirements for Location Based Services and Mobile Phones. 352-357 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2795&spage=352 2003 conf/mhci/2003 Mobile HCI db/conf/mhci/mhci2003.html#OsmanMT03