Fixed-Point Approaches to Stability and Existence in Nonlinear $\psi$-Caputo Fractional Systems. Nonlinear Studies, [S. l.], v. 32, n. 4, p. 1129–1145, 2025. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/3997. Acesso em: 13 jan. 2026.