@inproceedings{CIKM-2009-ZhaoC,
	author        = "Le Zhao and Jamie Callan",
	booktitle     = "{Proceedings of the 18th ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/1645953.1646175",
	isbn          = "978-1-60558-512-3",
	pages         = "1573--1576",
	publisher     = "{ACM}",
	title         = "{Effective and efficient structured retrieval}",
	year          = 2009,
}