Vassilis Stoumpos Antonios Deligiannakis Yannis Kotidis Alex Delis Processing Event-Monitoring Queries in Sensor Networks. 1436-1438 2008 ICDE http://doi.ieeecomputersociety.org/10.1109/ICDE.2008.4497581 conf/icde/2008 db/conf/icde/icde2008.html#StoumposDKD08