@inproceedings{SIGMOD-2005-LiCIS,
	author        = "Chengkai Li and Kevin Chen-Chuan Chang and Ihab F. Ilyas and Sumin Song",
	booktitle     = "{Proceedings of the 23rd ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1066157.1066173",
	isbn          = "1-59593-060-4",
	pages         = "131--142",
	publisher     = "{ACM}",
	title         = "{RankSQL: Query Algebra and Optimization for Relational Top-k Queries}",
	year          = 2005,
}