Investigation of Existence and Ulam’s type Stability for Coupled Fractal Fractional Differential Equations. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 18, n. 2, p. 5963, 2025. DOI: 10.29020/nybg.ejpam.v18i2.5963. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/5963. Acesso em: 23 jun. 2025.