1. D. Chaum. Untraceable Electronic Mail, Return Addresses, and Digital Pseudonyms, Communications of the ACM, v. 24, n. 2, Feb. 1981, pages 84–88.
2. D. Chaum, The Dining Cryptographers Problem: Unconditional Sender and Recipient Untraceability, Journal of Cryptology, 1/1, 1988, pages 65–75.
3. S. Chuang. Security Management of ATM Networks, Ph.D. thesis, in progress, Cambridge University.
4. D. E. Comer. Internetworking with TCP/IP, Volume 1: Principles, Protocols, and Architecture, Prentice-Hall, Engelwood Cliffs, New Jersey, 1995.
5. L. Cottrell. Mixmaster and Remailer Attacks, http://obscura.obscura.com/∼loki/remailer/remailer-essay.html