DAVID SPROWS. Using Spin, Twist and Dial Homeomorphisms to Generate Homeotopy Groups. Global Journal of Science Frontier Research, [S. l.], v. 16, n. F6, p. 21–36, 2016. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/1918. Acesso em: 3 may. 2024.