FONCTIONS SPECTRALES D’UNE CERTAINE CLASSE D’OPERATEURS SYMETRIQUES. Sciences & Technology. A, exactes sciences, [S. l.], n. 17, p. 7–10, 2002. Disponível em: http://conferences.umc.edu.dz/a/article/view/1777. Acesso em: 21 sep. 2025.