@inproceedings{CIKM-2011-LiangXL,
	author        = "Xueyao Liang and Min Xie and Laks V. S. Lakshmanan",
	booktitle     = "{Proceedings of the 20th ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/2063576.2063821",
	isbn          = "978-1-4503-0717-8",
	pages         = "1699--1708",
	publisher     = "{ACM}",
	title         = "{Adding structure to top-k: from items to expansions}",
	year          = 2011,
}