1. MPEG-4. ISO-IEC 14496-16. Coding of audio-visual objects: Animation framework extension (AFX). Available at http://mpeg.chiariglione.org/standards/ mpeg-4/animation-framework-extension-afx.
2. Hoppe, H.; DeRose, T.; Duchamp, T.; Halstead, M.; Jin, H.; McDonald, J.; Schweitzer, J.; Stuetzle, W. Piecewise smooth surface reconstruction. In: Proceedings of the 21st Annual Conference on Computer Graphics and Interactive Techniques, 295–302, 1994.
3. DeRose, T.; Kass, M.; Truon, T. Subdivision surfaces in character animation. In: Proceedings of the 25th Annual Conference on Computer Graphics and Interactive Techniques, 85–94, 1998.
4. Stam, J. On subdivision schemes generalizing uniform B-spline surfaces of arbitrary degree. Computer Aided Geometric Design Vol. 18, No. 5, 383–396, 2001.
5. Kosinka, J.; Sabin, M. A.; Dodgson, N. A. Semi-sharp creases on subdivision curves and surfaces. Computer Graphics Forum Vol. 33, No. 5, 217–226, 2014.