“Equivalence Between System of Volterra Integro-Fractional Differential Equations and Volterra Integral Equations”. Journal of the College of Basic Education 18, no. 74 (January 12, 2023): 159–176. Accessed June 4, 2026. https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/9389.