@inproceedings{SIGMOD-2002-DobraGGR,
	author        = "Alin Dobra and Minos N. Garofalakis and Johannes Gehrke and Rajeev Rastogi",
	booktitle     = "{Proceedings of the 20th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/564691.564699",
	isbn          = "1-58113-497-5",
	pages         = "61--72",
	publisher     = "{ACM}",
	title         = "{Processing complex aggregate queries over data streams}",
	year          = 2002,
}