VYATCHANINOV, O. V.; GORODNII, M. F. On the boundedness of one recurrent sequence in a banach space. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 61, n. 9, p. 1293–1296, 2009. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3100. Acesso em: 5 dec. 2025.