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