Edelsbrunner, Herbert, et al. “Arrangements of Curves in the Plane - Topology, Combinatorics, and Algorithms.”10.1007/3-540-19488-6_118__15th International Colloquium on Automata, Languages and Programming, vol. 317, Springer, 1988, pp. 214–29, doi:10.1007/3-540-19488-6_118.

Edelsbrunner, Herbert. “Geometric Structures in Computational Geometry.”10.1007/3-540-19488-6_117__15th International Colloquium on Automata, Languages and Programming, vol. 317, Springer, 1988, pp. 201–13, doi:10.1007/3-540-19488-6_117.