Normal Self-injective Hyperrings. Baghdad Science Journal, Iraq, Baghdad, v. 19, n. 6(Suppl.), p. 1618, 2022. DOI: 10.21123/bsj.2022.7534. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/7534.. Acesso em: 1 may. 2024.