@inproceedings {269015, author = {Michael Walfish and J.D. Zamfirescu and Hari Balakrishnan and David Karger and Scott Shenker}, title = {Distributed Quota Enforcement for Spam Control}, booktitle = {3rd Symposium on Networked Systems Design \& Implementation (NSDI 06)}, year = {2006}, address = {San Jose, CA}, url = {https://www.usenix.org/conference/nsdi-06/distributed-quota-enforcement-spam-control}, publisher = {USENIX Association}, month = may }