M. A. Almalahi and S. K. Panchal, “E$_{alpha } $-Ulam-Hyers Stability Result for $psi $-Hilfer Nonlocal Fractional Differential Equation”, DNC, vol. 10, no. 2, pp. 275–288, Aug. 2026, doi: 10.5890/DNC.2021.06.008.