TEAM, S. Regular Elements of Semigroups of Continuous Functions and Differentiable Functions: Y. Punkla, Y. Kemprasit, S. Nenthein. Thai Journal of Mathematics, [S. l.], v. 3, n. 2, p. 137–144, 2005. Disponível em: https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/18. Acesso em: 2 may. 2024.