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Biocca, Frank, Harms, Chad, Burgoon, Judee K. (2003): Towards A More Robust Theory and Measure of Social Presence: Review and Suggested Criteria. In Presence: Teleoperators and Virtual Environments, 12 (5) pp. 456-480.
Krikorian, Dean H., Lee, Jae-Shin, Chock, T. Makana, Harms, Chad (2000): Isn\'t That Spatial?: Distance and Communication in a 2-D Virtual Environment. In J. Computer-Mediated Communication, 5 (4) pp. . http://jcmc.indiana.edu/vol5/issue4/krikorian.html