Team, Support. “Regularity of the Semigroups of Transformations With a Fixed Point Set: Ronnason Chinram, Winita Yonthanthum”. Thai Journal of Mathematics 18, no. 3 (September 1, 2020): 1261–1268. Accessed May 7, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/1070.