@inproceedings{SIGMOD-2003-LakshmananPZ,
	author        = "Laks V. S. Lakshmanan and Jian Pei and Yan Zhao",
	booktitle     = "{Proceedings of the 31st ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/872757.872768",
	isbn          = "1-58113-634-X",
	pages         = "64--75",
	publisher     = "{ACM}",
	title         = "{QC-Trees: An Efficient Summary Structure for Semantic OLAP}",
	year          = 2003,
}