@inproceedings{ICPR-1998-LiQ,
	author        = "Xiaobo Li and Xiaoqing Qu",
	booktitle     = "{Proceedings of the 14th International Conference on Pattern Recognition}",
	doi           = "10.1109/ICPR.1998.711921",
	isbn          = "0-8186-8512-3",
	pages         = "1230--1234",
	publisher     = "{IEEE Computer Society}",
	title         = "{Matching spatial relations using DB-tree for image retrieval}",
	year          = 1998,
}