Combing: The Hair of a Hairy Ball?. Geometry with the Hairy Ball Theorem: A Practical Proposal for Bringing the Sphere into the Mathematics Classroom. GJSFR [Internet]. 2023 Aug. 10 [cited 2026 Feb. 4];23(F4):1-8. Available from: https://testing.journalofscience.org/index.php/GJSFR/article/view/102699