1. SIAM NewsOnline;Farouki Rida T.
2. K.J.Weiler, Topological Structures for Geometric Modeling, Ph.D. Thesis,Rensselaer Polytechnic Institute, 1986.
3. STEP: International Standard ISO 10303-42. Industrial automation systems and integration - Product data representation and exchange - Part 42: Integrated generic resource: Geometric and topological representation, 2000.
4. A.Gaither, A boundary representation solid modeling data structure for general numerical grid generation, M.S. Thesis,Mississippi State University, 1997.