AL-HASHMI, S. A.; NAUMAN, S. K. A study of modules over rings and their extensions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 10, p. 1299–1312, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1636. Acesso em: 5 dec. 2025.