DERDAR, N.; ALSHAMMARI, M. .; ALSHAMMARI, S. .; ABDO , M. S. Existence and Stability of Nonlinear Langevin FDEs with Mixed <i>ψ</i>-Hilfer and <i>ψ</i>-Caputo Derivatives Under Nonlocal Boundary Conditions. Contemporary Mathematics , [S. l.], v. 7, n. 1, p. 742–773, 2026. DOI: 10.37256/cm.7120268724. Disponível em: https://ojs.wiserpub.com/index.php/CM/article/view/8724. Acesso em: 8 feb. 2026.