Almalahi, Mohammed A., Mohammed S. Abdo, and Satish K. Panchal. “$\psi$-Hilfer Fractional Functional Differential Equation by Picard Operator Method”. Journal of Applied Nonlinear Dynamics 9, no. 4 (August 17, 2026): 685–702. Accessed August 17, 2026. https://lhscientificpublishing.com/index.php/jand/article/view/615.