SMATI, A.; GUESBA, M. On the classes of $n$-Nadir’s and $n^*$-Nadir’s operators on Hilbert spaces. Carpathian Mathematical Publications, [S. l.], v. 17, n. 1, p. 137–145, 2025. DOI: 10.15330/cmp.17.1.137-145. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/7010. Acesso em: 5 dec. 2025.