Boundary-value problems for linear equations with a generalized invertible operator in a Banach space with basis. Neliniini Kolyvannya, [S. l.], v. 13, n. 4, p. 522–532, 2010. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/581. Acesso em: 21 jan. 2026.