AMMAR, Aymen; VEERAMANI, S. A note on the mapping theorem of essential pseudospectra on a Banach space. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 76, n. 3, p. 341–352, 2024. DOI: 10.3842/umzh.v76i3.7325. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7325. Acesso em: 5 dec. 2025.