CGAL 5.5.3 - Approximation of Ridges and Umbilics on Triangulated Surface Meshes
Bibliography
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F. Cazals and M. Pouget. Topology driven algorithms for ridge extraction on meshes. Technical Report RR-5526, INRIA, 2005.

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Yutaka Ohtake, Alexander Belyaev, and Hans-Peter Seidel. Ridge-valley lines on meshes via implicit surface fitting. ACM Trans. Graph., 23(3):609–612, 2004.