@inproceedings{CIKM-2012-LiXF,
	author        = "Guoliang Li and Jing Xu and Jianhua Feng",
	booktitle     = "{Proceedings of the 21st ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/2396761.2398590",
	isbn          = "978-1-4503-1156-4",
	pages         = "2144--2148",
	publisher     = "{ACM}",
	title         = "{Keyword-based k-nearest neighbor search in spatial databases}",
	year          = 2012,
}