CGAL 5.1.2 - 2D Visibility
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Francisc Bungiu, Michael Hemmer, John Hershberger, Kan Huang, and Alexander Kröller. Efficient computation of visibility polygons. CoRR, abs/1403.3905, 2014.

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D. T. Lee. Visibility of a simple polygon. Computer Vision, Graphics, and Image Processing, 22:207–221, 1983.