@inproceedings{SIGMOD-2007-LuoLWZ,
	author        = "Yi Luo and Xuemin Lin and Wei Wang and Xiaofang Zhou",
	booktitle     = "{Proceedings of the 25th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1247480.1247495",
	isbn          = "978-1-59593-686-8",
	pages         = "115--126",
	publisher     = "{ACM}",
	title         = "{Spark: top-k keyword query in relational databases}",
	year          = 2007,
}