Moustafa A. Hammad Walid G. Aref Ahmed K. Elmagarmid Stream Window Join: Tracking Moving Objects in Sensor-Network Databases. 75-84 2003 conf/ssdbm/2003 SSDBM http://csdl.computer.org/comp/proceedings/ssdbm/2003/1964/00/19640075abs.htm db/conf/ssdbm/ssdbm2003.html#HammadAE03