EBRAHIMI, M.M.; MAHMOUDI, M. On injectivity of projection and separated projection algebras. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 29, p. 43–54, 2012. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6062. Acesso em: 18 jul. 2026.