Ali El Mfadel, Said Melliani, and M’hamed Elomari. “New Existence Results for Nonlinear Functional Hybrid Differential Equations Involving the ψ−Caputo Fractional Derivative”. Results in Nonlinear Analysis 5, no. 1 (November 7, 2022): 78–86. Accessed October 18, 2024. https://nonlinear-analysis.com/index.php/pub/article/view/87.