EL KHCHIN, Ismail; BENBOUZIANE, Hassane; ECH-CH´ERIF EL KETTANI, Mustapha. Operator products and algebraic spectral subspace preservers. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 53, p. 36–49, 2025. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/5743. Acesso em: 24 apr. 2026.