@article{CormodeJestesLiYi11,
	author={Graham Cormode and Jeffrey Jestes and Feifei Li and Ke Yi},
	journal={{IEEE} Transactions on Knowledge and Data Engineering},
	number=12,
	pages={1903--1917},
	title={Semantics of Ranking Queries for Probabilistic Data },
	volume=23,
	year=2011,
}