Abdullah, D.Kh., K.H.F. Jwamer, and Sh.Sh. Ahmed. “The Quadratic B-Spline Method for Approximating Systems of Volterra Integro Fractional-Differential Equations Involving Both Classical and Fractional Derivatives”. Bulletin of the Karaganda University. Mathematics Series 120, no. 4 (December 30, 2025): 5–20. Accessed January 11, 2026. https://mts.buketov.edu.kz/mathematics-vestnik/article/view/956.