1. Representation and Approximation of Surfaces;Barnhill,1977
2. Smooth Interpolation in Triangles;Barnhill;Journal of Approximation Theory,1973
3. A New Twist for Computer Aided Geometric Design;Barnhill;Computer Graphics and Image Processing,1978
4. C1 Quintic Interpolation over Triangles: Two Explicit Representations, BICOM 80/2;Barnhill,1981
5. Surfaces for Computer Aided Design, Design Division;Coons,1964-1967