RUGIRI, Peter Githara. On bounded linear mappings of spectrum in Hilbert spaces. Journal of Physical and Applied Sciences (JPAS), [S. l.], v. 2, n. 1, p. 73–83, 2023. DOI: 10.51317/jpas.v2i1.402. Disponível em: https://www.journals.editononline.com/index.php/jpas/article/view/402. Acesso em: 5 aug. 2026.