ABDULLAH, D.Kh.; JWAMER, K.H.F.; AHMED, Sh.Sh. 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, [S. l.], v. 120, n. 4, p. 5–20, 2025. DOI: 10.31489/2025m4/5-20. Disponível em: https://mts.buketov.edu.kz/mathematics-vestnik/article/view/956. Acesso em: 16 jan. 2026.