David Chu Arsalan Tavakoli Lucian Popa 0002 Joseph M. Hellerstein Entirely Declarative Sensor Network Systems. 1203-1206 2006 conf/vldb/2006 VLDB http://www.vldb.org/conf/2006/p1203-chu.pdf db/conf/vldb/vldb2006.html#ChuT0H06