Prasertpong, Rukchart, and Sasisophit Buada. “Rough Interior Ideals and Rough Quasi-Ideals in Approximation Spaces of Semigroups under Preorder and Compatible Relations”. Suan Sunandha Science and Technology Journal 8, no. 1 (December 8, 2022): 21–26. Accessed May 3, 2024. https://li02.tci-thaijo.org/index.php/ssstj/article/view/381.