Existence and k-Mittag-Leffler-Ulam-Hyers stability results of k-generalized psi-Hilfer boundary value problem. Nonlinear Studies, [S. l.], v. 29, n. 2, 2022. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/2900. Acesso em: 1 oct. 2025.