FĂRCĂȘEANU, Maria; GRECU, Andrei; MIHĂILESCU, Mihai; STANCU-DUMITRU, Denisa. Perturbed eigenvalue problems: an overview. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 66, n. 1, p. 55–73, 2021. DOI: 10.24193/subbmath.2021.1.05. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1245. Acesso em: 14 jul. 2025.