PEREVERZEV, S. V. On complexity of the problem of finding solution for the Fredholm second type equations with smooth nuclei. I . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 1, p. 84–91, 1987. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9060. Acesso em: 5 dec. 2025.