@article{VLDB-2016-ChenXJL,
	author        = "Lei Chen 0031 and Jianliang Xu and Christian S. Jensen and Yafei Li",
	doi           = "10.14778/3007263.3007294",
	ee            = "http://www.vldb.org/pvldb/vol9/p1501-chen.pdf",
	journal       = "{Proceedings of the VLDB Endowment}",
	number        = 13,
	pages         = "1501--1504",
	title         = "{YASK: A Why-Not Question Answering Engine for Spatial Keyword Query Services}",
	volume        = 9,
	year          = 2016,
}