Y. Chawathe, S. Ratnasamy, L. Breslau, N. Lanham, and S. Shenker. SIGCOMM '03: Proceedings of the 2003 conference on Applications, technologies, architectures, and protocols for computer communications, page 407--418. New York, NY, USA, ACM, (2003)
R. Dingledine, M. Freedman, and D. Molnar. Designing Privacy Enhancing Technologies: International Workshop on Design Issues in Anonymity and Unobservability, Berkeley, CA, USA, July 25-26, 2000: Proceedings, (2001)