SANTIAGO AYALA, Y. Semigroups of class Co on l2(Z). Selecciones Matemáticas, [S. l.], v. 10, n. 02, p. 273 - 284, 2023. DOI: 10.17268/sel.mat.2023.02.04. Disponível em: https://revistas.unitru.edu.pe/index.php/SSMM/article/view/5560. Acesso em: 9 may. 2024.