SAWATRAKSA, N.; TANTONG, P. An Observation on the Natural Partial Order of Transformation Semigroups Restricted by an Equivalence Relation. Progress in Applied Science and Technology, Thailand, v. 12, n. 1, p. 17–22, 2022. DOI: 10.14456/past.2022.3. Disponível em: https://ph02.tci-thaijo.org/index.php/past/article/view/246019. Acesso em: 29 mar. 2024.