SALIM, S.H.; JWAMER, K.H.F.; SAEED, R.K. Solving Volterra-Fredholm integral equations by natural cubic spline function. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 109, n. 1, p. 124–130, 2023. DOI: 10.31489/2023m1/124-130. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/557. Acesso em: 27 aug. 2025.