@inproceedings {4422,
	title = {RankSQL: Query Algebra and Optimization for Relational Top-K Queries},
	booktitle = {ACM International Conference on Management of Data (SIGMOD)},
	year = {2005},
	doi = {10.1145/1066157.1066173},
	author = {Chengkai Li and Kevin Chen-Chuan Chang and Ihab Ilyas and Sumin Song}
}
