Lekkoksung, Nareupanat, Hataikhan Sanpan, and Somsak Lekkoksung. “Characterizations of Some Regularities in Ordered Ternary Semigroups in Terms of Fuzzy Subsets”. Communications in Mathematics and Applications 12, no. 2 (June 30, 2021): 325–333. Accessed June 16, 2025. http://www.journals.rgnpublications.com/index.php/cma/article/view/1489.