@article {zheleva:tois08, title = {Trusting Spam Reporters: A Reporter-based Reputation System for Email Filtering}, journal = {ACM Transactions on Information Systems}, volume = {27}, number = {1}, year = {2008}, note = {Full version in ACM library}, month = {December}, author = {Zheleva, Elena and Kolcz, Alek and Lise Getoor} }