1. Turtle geometry;Abelson,1982
2. Automatic parametrization of rational curves and surfaces I: Conies and conicoids;Abhyankar;Computer News,1987
3. Automatic parametrization, of rational curves and surfaces II: Conies and conicoids;Abhyankar;Computer News,1987
4. The theory of splines and their applications;Ahlberg,1967
5. Ray tracing with cones;Amanatides,1984