= Smooth Subdivision Surfaces Based on Triangles by Charles Loop
{c}
{tag=Work by Charles Loop}
{title2=1987}
Official publication record: https://www.microsoft.com/en-us/research/publication/smooth-subdivision-surfaces-based-on-triangles/
Master's thesis, Department of Mathematics, University of Utah. The publication page confirms author, title and year; its large PDF was not accessible through the browser during this review. The original-mask formulas are instead checked against Loop's accessible 2000 report.
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