1. Hoggan, E., Brewster, S.A., Johnston, J.: Investigating the effectiveness of tactile feedback for mobile touchscreens. In: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, pp. 1573–1582. ACM (2008)
2. Ma, Z., Edge, D., Findlater, L., Tan, H.Z.: Haptic keyclick feedback improves typing speed and reduces typing errors on a flat keyboard. In: 2015 IEEE World Haptics Conference (WHC), pp. 220–227. IEEE (2015)
3. Murmann, G., Bauer, G.: Low profile switch. US Patent 4,467,160, 21 August 1984
4. Weir, D.W., Peshkin, M., Colgate, J.E., Buttolo, P., Rankin, J., Johnston, M.: The haptic profile: capturing the feel of switches. In: Proceedings of 12th International Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems, HAPTICS 2004, pp. 186–193. IEEE (2004)
5. Harris, R.H.: Catastrophically buckling compression column switch and actuator. US Patent 3,699,296, 17 October 1972