DIABA, F.; CHEREMNIKH, E. V. On rank one perturbation of continuous spectrum which generates given finite point spectrum. Methods of Functional Analysis and Topology, [S. l.], v. 14, n. 1, p. 20–31, 2008. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/367. Acesso em: 18 dec. 2025.