@inproceedings{SIGMOD-2004-HaasK,
	author        = "Peter J. Haas and Christian Koenig",
	booktitle     = "{Proceedings of the 32nd ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1007568.1007601",
	isbn          = "1-58113-859-8",
	pages         = "275--286",
	publisher     = "{ACM}",
	title         = "{A Bi-Level Bernoulli Scheme for Database Sampling}",
	year          = 2004,
}