Team S. Regular Elements of Semigroups of Continuous Functions and Differentiable Functions: Y. Punkla, Y. Kemprasit, S. Nenthein. Thai J Math [Internet]. 2005 Dec. 1 [cited 2024 May 2];3(2):137-44. Available from: https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/18