G. Christou, P. Zaphiris, C. Ang, and E. Law. CHI '11 Extended Abstracts on Human Factors in Computing Systems, page 879--882. New York, NY, USA, ACM, (2011)
S. Vickers, H. Istance, A. Hyrskykari, N. Ali, and R. Bates. Proceedings of the 7th International conference on disability, virtual reality and associated technologies: ICDVRAT 2008, (September 2008)
M. Boberg, P. Piippo, and E. Ollila. DIMEA '08: Proceedings of the 3rd international conference on Digital Interactive Media in Entertainment and Arts, page 232--239. New York, NY, USA, ACM, (2008)