CGAL 5.6 - 2D Circular Geometry Kernel
Bibliography
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Olivier Devillers, Alexandra Fronville, Bernard Mourrain, and Monique Teillaud. Algebraic methods and arithmetic filtering for exact predicates on circle arcs. Comput. Geom. Theory Appl., 22:119–142, 2002.

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Ioannis Z. Emiris, Athanasios Kakargias, Sylvain Pion, Monique Teillaud, and Elias P. Tsigaridas. Towards an open curved kernel. In Proc. 20th Annu. ACM Sympos. Comput. Geom., pages 438–446, 2004.