Weakly nonlinear boundary-value problems for Fredholm integral equations with degenerate kernel in Banach spaces. Neliniini Kolyvannya, [S. l.], v. 21, n. 3, p. 347–357, 2018. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/914. Acesso em: 8 dec. 2025.