HOQUE, M.F.; PAUL, A.C. CENTRALIZERS ON SEMIPRIME GAMMA RINGS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 30, p. 289–302, 2013. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6078. Acesso em: 18 jul. 2026.