D. Chaum. 
Untraceable Electronic Mail, Return addresses, and Digital Pseudonyms.
Communications of the ACM, Vol 24 Number 2, February 1981

L. Cottrell. Mixmaster & Remailer Attacks.
<http://www.obscura.com/~loki/remailer/remailer-essay.html>

U. Moeller. Mixmaster 2.9 source code.
<http://www.sf.net/projects/mixmaster>

L. Cottrell, U. Moeller. Mixmaster Protocol Version 2.
Internet Engineering Task Force, January 2000

G. Danezis, R. Dingledine, D. Hopwood, and N. Mathewson. 
Mixminion: Design of a Type III Anonymous Remailer. Not yet published.

M. Stoeger. The Remailer Abuse Blocklist.
<http://www.paracrypt.com/remailerabuse/>

Cmeclax. Nilsimsa.
<http://freedom.gmsociety.org/cmeclax/nilsimsa.html>

I. Goldberg. 
A Pseudonymous Communications Infrastructure for the Internet.
U.C. Berkeley Doctorate Thesis, August 2000
<http://www.isaac.cs.berkeley.edu/~iang/thesis-final.pdf>

U.S. District Court, Northern District of Georgia, Atlanta Division
ACLU of Georgia v. Miller Decision
http://www.aclu.org/court/aclugavmiller.html