1. E. Chionh, Base points, resultants and the implicit representation of rational surfaces, Ph.D. Thesis, Department of Computer Science, University of Waterloo, Canada, 1990.
2. Clifford algebra, Lorentzian geometry, and rational parametrization of canal surfaces;Cho;Comput. Aided Geom. design,2004
3. Differential Geometry of Curves and Surfaces;do Carmo,1976
4. Analytic properties of plane offset curves;Farouki;Comput. Aided Geom. Design,1990
5. Algebraic properties of plane offset curves;Farouki;Comput. Aided Geom. Design,1990