1. (1) Pixologic, Zbrush. (online), available from<http://www.zbrush.com>, (accessed 2011).
2. (2) Autodesk, Mudbox. (online). available: from < http://usa.autodesk.com/adsk/servlet/pc/index?id=13565063&siteID=123112>, (accessed 2011).
3. B-Mesh: A Modeling System for Base Meshes of 3D Articulated Shapes
4. (4) Cornea, N. D., Silver, D. and Min, P., Curve-skeleton properties, applications, and algorithms, IEEE Transactions on Visualization and Computer Graphics, Vol. 13, No.3 (2007), pp.530-548.
5. (5) Hilaga, M., Shinagawa, Y., Kohmura, T. and Kunii, T. L., Topology matching for fully automatic similarity estimation of 3D shapes, Proceedings of the 28th annual conference on Computer graphics and interactive techniques, (2001), pp.203-212.