ALEXANDROV, E; HEBBECHE, A. FONCTIONS SPECTRALES D’UNE CERTAINE CLASSE D’OPERATEURS SYMETRIQUES. Sciences & Technology. A, exactes sciences, [S. l.], n. 17, p. 7–10, 2002. Disponível em: https://revue.umc.edu.dz/a/article/view/1777. Acesso em: 18 dec. 2024.