@inproceedings{VLDB-2007-ChenCB,
	author        = "Aiyou Chen and Jin Cao and Tian Bu",
	booktitle     = "{Proceedings of the 33rd International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/2007/papers/research/p171-chen.pdf",
	isbn          = "978-1-59593-649-3",
	pages         = "171--182",
	publisher     = "{ACM}",
	title         = "{A Simple and Efficient Estimation Method for Stream Expression Cardinalities}",
	year          = 2007,
}