Yannis Labrou Jonathan R. Agre Lusheng Ji Jesus Molina Wei-lun Chen 32-41 2004 conf/mobiquitous/2004 MobiQuitous http://csdl.computer.org/comp/proceedings/mobiquitous/2004/2208/00/22080032abs.htm db/conf/mobiquitous/mobiquitous2004.html#LabrouAJMC04