Jwamer, K.H.F., Ahmed, Sh.Sh., & Abdullah, D.Kh. (2021). Approximate Solution of Volterra Integro-Fractional Differential Equations Using Quadratic Spline Function. Bulletin of the Karaganda University. Mathematics Series, 1(101), 50–64. https://doi.org/10.31489/2021m1/50-64