Brian Babcock Mayur Datar Rajeev Motwani Load Shedding for Aggregation Queries over Data Streams. 350-361 2004 conf/icde/2004 ICDE http://doi.ieeecomputersociety.org/10.1109/ICDE.2004.1320010 db/conf/icde/icde2004.html#BabcockDM04