Noreddin , M. M., and N. Ya. Tikhonenko. “On Convergence of the Method of Orthogonal Polynomials of the Approximate Solution оf the Second Order Integral Equations With $\Pi$-Kernels”. Ukrains’kyi Matematychnyi Zhurnal 43, no. 2 (June 30, 2025): 223–229. Accessed December 7, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/9361.