@inproceedings {4081,
	title = {Overview of the TREC 2012 Web Track},
	booktitle = {Text Retrieval Conference (TREC)},
	year = {2012},
	url = {http://trec.nist.gov/pubs/trec21/papers/WEB12.overview.pdf},
	author = {Charles Clarke and Nick Craswell and Ellen M. Voorhees}
}
