Testing bipartiteness of geometric intersection graphs

@article{Eppstein2003TestingBO,  title={Testing bipartiteness of geometric intersection graphs},  author={David Eppstein},  journal={ACM Trans. Algorithms},  year={2003},  volume={5},  pages={15:1-15:35},  url={https://api.semanticscholar.org/CorpusID:60496}}
We show how to test the bipartiteness of an intersection graph of n line segments or simple polygons in the plane, or of balls in Rd, in time O(n log n). More generally we find subquadratic

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