@inproceedings {4220,
	title = {TREC 2007 Spam Track Overview},
	booktitle = {Text Retrieval Conference (TREC)},
	year = {2007},
	url = {http://trec.nist.gov/pubs/trec16/papers/SPAM.OVERVIEW16.pdf},
	author = {Gordon Cormack}
}
