Derdar, Nedjemeddine, Mohammad Alshammari, Saleh Alshammari, and Mohammed 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 7, no. 1 (January 27, 2026): 742–773. Accessed February 8, 2026. https://ojs.wiserpub.com/index.php/CM/article/view/8724.