AL-BAHRANI, B. On Purely –Extending Modules. Iraqi Journal of Science, [S. l.], v. 54, n. 3, p. 672–675, 2023. Disponível em: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12172.. Acesso em: 8 dec. 2025.