representation equivalent to a knot vector without knot origin ... Zheng, D. Sewell and M. Sabin,'Non-uniform Subdivision Surfaces,' SIGGRAPH 1998. ...
Workshop on Algebraic Spline Curves and Surfaces, May 17-18, 2006, Eger, Hungary ... Sapiro, 'Geodesic active contours', International Journal of Computer Vision, 22 ...