@inproceedings{VLDB-1999-IoannidisP,
	author        = "Yannis E. Ioannidis and Viswanath Poosala",
	booktitle     = "{Proceedings of the 25th International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/1999/P15.pdf",
	isbn          = "1-55860-615-7",
	pages         = "174--185",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Histogram-Based Approximation of Set-Valued Query-Answers}",
	year          = 1999,
}