1. An Introduction to Splines for Use in Computer Graphics and Geometric Modelling;Bartels,1987
2. Computer Graphics and Geometric Modelling using Beta-splines;Barsky,1988
3. On beta continuous functions and their applications to the construction of geometrically continuous curves and surfaces;Barsky;Mathematical Methods in Computer Aided Geometric Design,1989
4. Curvature continuous curves and surfaces;Boehm;Computer Aided Geometric Design,1985
5. Comportamento delle funzioni beta-splines con valori del parametro β2 negativi;De Tisi,1990