1. Software Worlds and the First Amendment: Virtual Doorkeepers in Cyberspace;M Ethan Katsh;U. CHI. LEGAL F,1996
2. The Law of the Horse: What Cyberlaw Might Teach, 113 HARV;Lawrence Lessig;L. REV,1999
3. For non-legal treatments, see;L Tex;CITY OF BITS: SPACE, PLACE, AND THE INFOBAHN,1995