Derdar, N., M. . Alshammari, S. . Alshammari, and M. S. Abdo. “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, vol. 7, no. 1, Jan. 2026, pp. 742-73, doi:10.37256/cm.7120268724.