Geodesic
A Basic Evaluation Method of Subdivision Surfaces
Journal for geometry and graphics, Tome 5 (2001) no. 2, pp. 145-156.

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A subdivision surface is a powerful tool to represent a smooth surface with arbitrary topology. It starts with a control polyhedron which roughly approximates the final surface. The polyhedron gradually approaches to the final surface by subdividing faces more closely to approximate the final surface. However, it is not so popular in engineering applications because of the procedural nature. Algorithms for parametric surfaces cannot be applicable to a procedural surface. This paper discusses a method for evaluating a subdivision surface with parametric values based on Stam's work. Our approach gained stability around an extraordinary point as well as the convergence of a normal vector at the point. 
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     author = {Y. Yamaguchi},
     title = {A {Basic} {Evaluation} {Method} of {Subdivision} {Surfaces}},
     journal = {Journal for geometry and graphics},
     pages = {145--156},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {2001},
     url = {http://geodesic.mathdoc.fr/item/JGG_2001_5_2_a3/}
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Y. Yamaguchi. A Basic Evaluation Method of Subdivision Surfaces. Journal for geometry and graphics, Tome 5 (2001) no. 2, pp. 145-156. http://geodesic.mathdoc.fr/item/JGG_2001_5_2_a3/