GORODNII, M. F. $l_p$-Solutions of One Difference Equation in a Banach Space. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 3, p. 425–430, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3916. Acesso em: 5 dec. 2025.