Brian Babcock Mayur Datar Rajeev Motwani Load Shedding for Aggregation Queries over Data Streams. 350-361 2004 conf/icde/2004 ICDE http://csdl.computer.org/comp/proceedings/icde/2004/2065/00/20650350abs.htm db/conf/icde/icde2004.html#BabcockDM04