Combing: The Hair of a Hairy Ball?. Geometry with the Hairy Ball Theorem: A Practical Proposal for Bringing the Sphere into the Mathematics Classroom. Global Journal of Science Frontier Research, [S. l.], v. 23, n. F4, p. 1–8, 2023. Disponível em: https://testing.journalofscience.org/index.php/GJSFR/article/view/102699. Acesso em: 4 feb. 2026.