D. Cotting, und M. Gross. UIST '06: Proceedings of the 19th annual ACM symposium on User interface software and technology, Seite 245--254. New York, NY, USA, ACM, (2006)
C. Cruz-Neira, D. Sandin, und T. DeFanti. SIGGRAPH '93: Proceedings of the 20th annual conference on Computer graphics and interactive techniques, Seite 135--142. New York, NY, USA, ACM, (1993)