@article {3523,
	title = {Spam and the Ongoing Battle for the Inbox},
	journal = {Communications of the ACM},
	volume = {50},
	year = {2007},
	pages = {24--33},
	doi = {10.1145/1216016.1216017},
	author = {Joshua Goodman and Gordon Cormack and David Heckerman}
}
