D. Pareek, M. Jhaveri, M. Kapasi, und M. Trivedi. International Journal of Computer Science, Engineering and Information Technology (IJCSEIT), 2 (5):
45-54(Oktober 2012)
M. Morris, und E. Horvitz. Proceedings of the 20th annual ACM symposium on User interface software and technology, Seite 3--12. New York, NY, USA, ACM, (2007)