Sharif, Abdulrahman A., and Ahmed A. Hamoud. 2026. “On $\psi$-Caputo Fractional Nonlinear Volterra-Fredholm Integro-Differential Equations”. Discontinuity, Nonlinearity, and Complexity 11 (1): 97-106. https://doi.org/10.5890/DNC.2022.03.008.