LINCHUK, Yu. S. Generalization of Rubel’s result for operators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 12, p. 1710–1716, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2836. Acesso em: 5 dec. 2025.