$\boldsymbol{Ψ}$-Bounded Solutions for a System of Difference Equations on $\mathbb{Z}$. Communications in Mathematical Research, [S. l.], v. 27, n. 4, p. 331–342, 2021. Disponível em: https://www.global-sci.com/index.php/cmr/article/view/8708. Acesso em: 6 dec. 2025.