Mohamed Helal, “Darboux problem for fractional partial hyperbolic differential inclusions on unbounded domains with delay”, Studia Universitatis Babeş-Bolyai Mathematica, 57:4 (2022), 703-716
Mohamed Helal, “Existence Results for Functional Perturbed Differential Equations of Fractional Order with State-Dependent Delay in Banach Spaces”, Vladikavkaz Mathematical Journal, 25:1 (2023), 112-130
Mohamed Helal, “Existence Results for Functional Perturbed Differential Equations of Fractional Order with State-Dependent Delay in Banach Spaces”, Vladikavkaz Mathematical Journal, 25:1 (2023), 112-130