RAFFOUL, . Y. N. Stability and boundedness in nonlinear and neutral difference equations using new variation of parameters formula and fixed point theory. CUBO, A Mathematical Journal, [S. l.], v. 21, n. 3, p. 39–61, 2020. DOI: 10.4067/S0719-06462019000300039. Disponível em: https://www.perspectivasdelacomunicacion.cl/ojs/index.php/cubo/article/view/2219. Acesso em: 16 may. 2024.