Damianos Chatziantoniou Yannis Sotiropoulos Stream Variables: A Quick but not Dirty SQL Extension for Continuous Queries. 19-28 2007 conf/icde/2007w ICDE Workshops http://dx.doi.org/10.1109/ICDEW.2007.4400969 db/conf/icde/icdew2007.html#ChatziantoniouS07