Steven Lai Jiannong Cao Yuan Zheng PSWare: a Publish / Subscribe Middleware Supporting Composite Event in Wireless Sensor Network. 1-6 2009 PerCom Workshops http://dx.doi.org/10.1109/PERCOM.2009.4912862 conf/percom/2009w db/conf/percom/percomw2009.html#LaiCZ09