S. Jamin, L. Zhang, D. Clark, and S. Shenker. Proceedings of the Third International Workshop on
Networking and Operating System Support for Digital
Audio and Video, Springer-Verlag, New York, (1993)
T. Kelly, Y. Chan, S. Jamin, and J. Mackie-Mason. Proceedings of the Fourth International Web Caching
Workshop, San Diego, California, (April 1999)Available on the Web at,
http://ai.eecs.umich.edu/\~tpkelly/papers/ wlfu.ps.