Mehlhorn, Kurt Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Seel, Michael Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Mehlhorn, K., & Seel, M. (2003). Infimaximal frames: A technique for making lines look like segments. International Journal of Computational Geometry & Applications, 13, 241-255.