Boundedness in Nonlinear Functional Difference Equations via Non-negative Definite Lyapunov Functionals with Applications to Volterra Discrete Systems. Nonlinear Studies, [S. l.], v. 13, n. 1, 2006. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/248. Acesso em: 17 oct. 2025.