CGAL 5.5.2 - 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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P. W. Hallinan, G. Gordon, A.L. Yuille, P. Giblin, and D. Mumford. Two-and Three-Dimensional Patterns of the Face. A.K.Peters, 1999.

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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.