Solvability of difference equations with nonuniformly contracting operators on the space of two-sided sequences. Neliniini Kolyvannya, [S. l.], v. 20, n. 3, p. 401–410, 2017. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/876. Acesso em: 12 apr. 2026.