CGAL 6.0 - 2D Movable Separability of Sets
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Shahar Shamai and Dan Halperin. On the separation of a polyhedron from its single-part mold. In Abstracts 32nd European Workshop Comput. Geom., pages 99–102, 2016.
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Neal R. Wagner. The sofa problem. The American Mathematical Monthly, 83(3):188–189, 1976.