@article{YiLiCormodeHadjieleftheriouKolliosSrivastava09,
	author={Ke Yi and
               Feifei Li and
               Graham Cormode and
               Marios Hadjieleftheriou and
               George Kollios and
               Divesh Srivastava},
	journal={{ACM} Transactions on Database Systems},
	number=3,
	title={Small synopses for group-by query verification on outsourced
               data streams},
	volume=34,
	year=2009,
}