Conditions for absolute instability of solutions of difference equations with self-adjoint operator coefficients. Neliniini Kolyvannya, [S. l.], v. 22, n. 1, p. 118–129, 2019. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/940. Acesso em: 21 jan. 2026.