@inproceedings{CIKM-2011-DuanLZ,
	author        = "Huizhong Duan and Rui Li and ChengXiang Zhai",
	booktitle     = "{Proceedings of the 20th ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/2063576.2063884",
	isbn          = "978-1-4503-0717-8",
	pages         = "2037--2040",
	publisher     = "{ACM}",
	title         = "{Automatic query reformulation with syntactic operators to alleviate search difficulty}",
	year          = 2011,
}