URUMBAEV, A. N. On the optimization of direct methods for solving fredholm integral equations of the second kind with infinitely smooth kernels. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 12, p. 1695–1701, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5978. Acesso em: 11 apr. 2025.