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inria-00329762v1  Book sections
Frédéric CazalsJean-Charles FaugèreMarc PougetFabrice Rouillier. Ridges and Umbilics of Polynomial Parametric Surfaces
B. Juttler and R. Piene. Geometric Modeling and Algebraic Geometry, Springer, pp.141--159, 2008, 978-3-540-72184-0. ⟨10.1007/978-3-540-72185-7_8⟩