Daniel Gyllstrom Jagrati Agrawal Yanlei Diao Neil Immerman On Supporting Kleene Closure over Event Streams. 1391-1393 2008 ICDE http://dx.doi.org/10.1109/ICDE.2008.4497566 conf/icde/2008 db/conf/icde/icde2008.html#GyllstromADI08