ZHANG, Bo. Boundedness and Global Attractivity of Solutions for a System of Nonlinear Integral Equations. CUBO, A Mathematical Journal, [S. l.], v. 11, n. 3, p. 41–53, 2009. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1461. Acesso em: 12 oct. 2025.