RUGIRI, Peter Githara. Decomposition and properties of a spectrum. Journal of Physical and Applied Sciences (JPAS), [S. l.], v. 2, n. 1, p. 55–64, 2023. DOI: 10.51317/jpas.v2i1.394. Disponível em: https://www.journals.editononline.com/index.php/jpas/article/view/394. Acesso em: 5 aug. 2026.