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Geometric Modeling and Processing 2004   p. 365
Generalized NURBS Curves and Surfaces
Qing Wang, Zhejiang University, Hangzhou, China
Wei Hua, Zhejiang University, Hangzhou, China
Guiqing Li, Zhejiang University, Hangzhou, China
Hujun Bao, Zhejiang University, Hangzhou, China

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DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/GMAP.2004.1290061
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Abstract
A novel representation, the generalized NURBS(G-NURBS), is proposed for modeling parametric curves and surfaces. G-NURBS provides a unified framework for traditional parametric curve and surface. G-NURBS surface based on arbitrary irregular mesh, can represent closed surface or trimmed surface with only one surface patch.
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Citation:  Qing Wang, Wei Hua, Guiqing Li, Hujun Bao, "Generalized NURBS Curves and Surfaces," gmp, p. 365,  Geometric Modeling and Processing 2004,  2004