K. Nebe, F. Klompmaker, H. Jung, and H. Fischer. Human-Computer Interaction, volume 6762 of Lecture Notes in Computer Science, page 100--109. Springer, (2011)
I. Oakley, and S. O'Modhrain. Proceedings of the First Joint Eurohaptics Conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems, page 40--49. Washington, DC, USA, IEEE Computer Society, (2005)