Sayed, S. M. ., A. S. . Mohamed, E. M. A. El-Dahab, and Y. H. . Youssri. “Alleviated Shifted Gegenbauer Spectral Method for Ordinary and Fractional Differential Equations”. Contemporary Mathematics, vol. 5, no. 2, May 2024, pp. 4123-49, doi:10.37256/cm.5220244559.