Structural Analysis of Quasi-Idempotents in Full Contraction Semigroups via Directed Graphs. Babylonian Journal of Mathematics, [S. l.], v. 2026, p. 20–27, 2026. DOI: 10.58496/BJM/2026/003. Disponível em: https://journals.mesopotamian.press/index.php/BJM/article/view/1149. Acesso em: 7 jul. 2026.