@inproceedings{PODS-2000-KoudasMS,
	author        = "Nick Koudas and S. Muthukrishnan and Divesh Srivastava",
	booktitle     = "{Proceedings of the 19th Symposium on Principles of Database Systems}",
	doi           = "10.1145/335168.335223",
	isbn          = "1-58113-214-X",
	pages         = "196--204",
	publisher     = "{ACM}",
	title         = "{Optimal Histograms for Hierarchical Range Queries}",
	year          = 2000,
}