URUMBAEV, A. N. Optimization of direct methods for the approximate solution of weakly singular integral equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 9, p. 1246–1254, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5641. Acesso em: 5 dec. 2025.