@inproceedings{SIGMOD-2006-LiCI,
	author        = "Chengkai Li and Kevin Chen-Chuan Chang and Ihab F. Ilyas",
	booktitle     = "{Proceedings of the 24th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1142473.1142481",
	isbn          = "1-59593-256-9",
	pages         = "61--72",
	publisher     = "{ACM}",
	title         = "{Supporting ad-hoc ranking aggregates}",
	year          = 2006,
}