@inproceedings{ duan05differentiated,
    author = "Zhenhai Duan and Yingfei Dong and Kartik Gopalan",
    title = "A Differentiated Message Delivery Architecture to Control Spam",
    booktitle = "Proc. of Workshop on Security in Networks and Distributed Systems (SNDS05), Fukoka, Japan",
    year = "July 2005"
}