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A counterexample to a corollary of Kim et al

Ulrich Reif | Klaus Spitzmüller | Günter Aumann

[1] Deok-Soo Kim,et al. Tangent, normal, and visibility cones on Bézier surfaces , 1995, Comput. Aided Geom. Des..

[2] Deok-Soo Kim,et al. Detection of degenerate normal vectors on parametric surfaces: Tangent cone approach , 1995, Comput. Aided Geom. Des..