IskakovaN. B., AssanovaA. T., and BakirovaE. A. “Numerical Method for the Solution of linear boundary-Value Problem for Integrodifferential Equations Based on spline approximations”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 71, no. 9, Sept. 2019, pp. 1176-91, https://umj.imath.kiev.ua/index.php/umj/article/view/1508.