@article {3665,
	title = {Probabilistic Top-k and Ranking-Aggregate Queries},
	journal = {ACM Transactions on Database Systems (TODS)},
	volume = {33},
	year = {2008},
	pages = {13:1--13:54},
	doi = {10.1145/1386118.1386119},
	author = {Mohamed A. Soliman and Ihab Ilyas and Kevin Chen-Chuan Chang}
}
