1. A Practical Guide to Splines;de Boor,1985
2. Spline approximation by quasi-interpolants;de Boor;J. Approx. Theory,1973
3. Parametric curve fitting with shape control;Ferguson;Boeing Computer Services Technical Report ETA-TR-20,1984
4. Construction of curves and surfaces using numerical optimization techniques;Ferguson;Computer-aided Design,1986
5. Convexity preserving interpolation maps;Ferguson;Boeing Computer Services, Technical Report ETA-TR-86,1986