ELGABEUR, Bilel. Characterization and stability of essential pseudospectra by measure of polynomially inessential operators. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 70, n. 4, p. 685–708, 2025. DOI: 10.24193/subbmath.2025.4.11. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/9782. Acesso em: 15 dec. 2025.