@inproceedings {4221,
	title = {University of Waterloo Participation in the TREC 2007 Spam Track},
	booktitle = {Text Retrieval Conference (TREC)},
	year = {2007},
	url = {http://trec.nist.gov/pubs/trec16/papers/uwaterloo.spam.pdf},
	author = {Gordon Cormack}
}
