1. Diagnostic and statistical manual of mental disorders;American Psychiatric Association,1994
2. The sense of presence within virtual environments: A conceptual framework;Barfield,1993
3. Virtual Reality in the treatment of spider phobia: An experimental controlled study;Goetestam,1996
4. Presence in virtual environments as a function of visual and auditory cues;Hendrix,1995
5. Presence as the defining factor in a VR application;Hodges;Georgia Institute of Technology, Graphics, Visualization, and Usability Center, Technical Report GIT-GVU-94-5,1995