DAKHEEL , Shireen O. En-prime Subacts over Monoids with Zero. Iraqi Journal of Science, [S. l.], v. 58, n. 1B, p. 280–283, 2022. Disponível em: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/6160.. Acesso em: 5 dec. 2025.