1. 3D Systems. 3D Systems [Internet]. 2015. Available from: http://www.geomagic.com/en/products-landing-pages/haptic
2. Force Dimension. Force Dimension [Internet]. 2012. Available from: http://www.forcedimension.com
3. Inc. Novint Technologies. Novint Technologies [Internet]. 2012. Available from: http://home.novint.com
4. Kawasaki H, Takai J, Tanaka Y, Mrad C, Mouri T. Control of multi-fingered haptic interface opposite to human hand. In: Proceedings 2003 IEEERSJ International Conference on Intelligent Robots and Systems IROS 2003 [Internet]. Ieee; 2003. p. 2707–12. Available from: http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1249279
5. Dynamic force feedback in a virtual knee palpation;NA Langrana;Artif Intell Med,1994