Team, Support. “Semigroups of Full Transformations With the Restriction on the Fixed Set Is Bijective: Ekkachai Laysirikul”. Thai Journal of Mathematics 14, no. 2 (August 1, 2016): 497–503. Accessed May 18, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/613.