@inproceedings{CIKM-2011-SantosMO,
	author        = "Rodrygo L. T. Santos and Craig Macdonald and Iadh Ounis",
	booktitle     = "{Proceedings of the 20th ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/2063576.2063859",
	isbn          = "978-1-4503-0717-8",
	pages         = "1937--1940",
	publisher     = "{ACM}",
	title         = "{Effectiveness beyond the first crawl tier}",
	year          = 2011,
}