C. Xu, A. Israr, I. Poupyrev, O. Bau, and C. Harrison. CHI '11 Extended Abstracts on Human Factors in Computing Systems, page 317--322. New York, NY, USA, ACM, (2011)
I. Kurtev, J. Bézivin, F. Jouault, and P. Valduriez. OOPSLA '06: Companion to the 21st ACM SIGPLAN Symposium on Object-oriented Programming Systems, Languages, and Applications, Portland, OR, USA, page 602-616. (2006)
F. Flippo, A. Krebs, and I. Marsic. Proceedings of the 5th International Conference on Multimodal Interfaces (ICMI '03), Vancouver, Canada, page 109-116. (2003)