1. Film;Arnheim,1957
2. Making them move: Mechanics, control, and animation of articulated figures;Badler,1991
3. Bridging the gulfs: From hypertext to cyberspace;Bardini;Journal of Computer Mediated-Communication On-line,1997
4. Presence and performance within virtual environments;Barfield,1995
5. Steps to an ecology of mind;Bateson,1972