Orthogonal projections approach to characterization of numerical ranges of elementary operators. Mathematical Analysis and its Contemporary Applications, [S. l.], v. 7, n. 1, 2025. DOI: 10.30495/maca.2025.2053352.1128. Disponível em: https://oiccpress.com/maca/article/view/19357. Acesso em: 21 aug. 2026.