[1]

F. Cazals and M. Pouget. Smooth surfaces, umbilics, lines of curvatures, foliations, ridges and the medial axis: selected topics. Int. J. of Computational Geometry and Applications, 15(5):511–536, 2005.

[2]

F. Cazals and M. Pouget. Topology driven algorithms for ridge extraction on meshes. Technical Report RR-5526, INRIA, 2005.

[3]

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.

[4]

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.

[5]

I. Porteous. Geometric Differentiation (2nd Edition). Cambridge University Press, 2001.