CHEN, A.; SHEN, J. L. A note on property (gaR) and perturbations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 7, p. 974–983, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1750. Acesso em: 5 dec. 2025.