Exact Evaluation of Catmull-Clark Subdivision Surfaces at Arbitrary Parameter Values. Stam, J. In Computer Graphics Proceedings ACM SIGGRAPH, pages 395--404, 1998.
bibtex   
@inproceedings{stam_exact_1998,
	title = {Exact {Evaluation} of {Catmull}-{Clark} {Subdivision} {Surfaces} at {Arbitrary} {Parameter} {Values}},
	booktitle = {Computer {Graphics} {Proceedings} {ACM} {SIGGRAPH}},
	author = {Stam, Jos},
	year = {1998},
	pages = {395--404}
}

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