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Derdar, N., Alshammari, M. , Alshammari, S. and Abdo , M.S. 2026. 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 . 7, 1 (Jan. 2026), 742–773. DOI:https://doi.org/10.37256/cm.7120268724.