Salim, Sarfraz Hassan, et al. “SOLVING VOLTERRA-FREDHOLM INTEGRAL EQUATIONS BY QUADRATIC SPLINE FUNCTION”. Journal of Al-Qadisiyah for Computer Science and Mathematics, vol. 14, no. 4, Dec. 2022, pp. Math Page 10-19, doi:10.29304/jqcm.2022.14.4.1092.