1. Rational beta-splines for representing curves and surfaces;Barsky;IEEE Computer Graphics and Applications,1993
2. Rational geometric splines;Boehm;Computer Aided Geometric Design,1987
3. Circle and sphere as rational splines;Bangert;Neural, Parallel and Scientific Computations,1997
4. Curves and Surfaces for Computer Aided Geometric Design A Practical Guide;Farin,1988
5. R.N. Goldman, B.A. Barsky, Beta Continuity and Its Application to Rational Beta-splines, Technical Report CSD-88-442, University of California, Berkeley, August 1988.