Sayed, S.M. , Mohamed, A.S. , El-Dahab, E.M.A. and Youssri, Y.H. 2024. Alleviated Shifted Gegenbauer Spectral Method for Ordinary and Fractional Differential Equations. Contemporary Mathematics. 5, 2 (May 2024), 4123–4149. DOI:https://doi.org/10.37256/cm.5220244559.