ALNAJAR, Sukaina Omar. Unbounded Linear Operators in Hilbert Spaces. Scientific Journal of Faculty of Education, Misurata University , [S. l.], v. 6, n. استثنائي, p. 176–191, 2019. Disponível em: https://journals.misuratau.edu.ly/edu/ojs/index.php/eduction/article/view/548. Acesso em: 6 nov. 2026.