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On Projective Umbilics: a Geometric Invariant and an Index. (arXiv:1911.01466v1 [math.DG]) http://arxiv.org/abs/1911.01466
On Projective Umbilics: a Geometric Invariant and an Index. (arXiv:1911.01466v1 [math.DG]) http://arxiv.org/abs/1911.01466