Generalised Hyers-Ulam Product-Sum Stability of a Cauchy Type Additive Functional Equation. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 4, n. 1, p. 50–58, 2011. Disponível em: https://ejpam.com/index.php/ejpam/article/view/677.. Acesso em: 21 jul. 2024.