@inproceedings {4226,
	title = {TREC 2006 Spam Track Overview},
	booktitle = {Text Retrieval Conference (TREC)},
	year = {2006},
	url = {http://trec.nist.gov/pubs/trec15/papers/SPAM06.OVERVIEW.pdf},
	author = {Gordon Cormack}
}
