@inproceedings{SIGMOD-2007-LiWLWC,
	author        = "Chengkai Li and Min Wang and Lipyeow Lim and Haixun Wang and Kevin Chen-Chuan Chang",
	booktitle     = "{Proceedings of the 25th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1247480.1247496",
	isbn          = "978-1-59593-686-8",
	pages         = "127--138",
	publisher     = "{ACM}",
	title         = "{Supporting ranking and clustering as generalized order-by and group-by}",
	year          = 2007,
}