HADI, Inaam M. A.; HUMOD, Ghaleb A. Strongly (Completely) Hollow Sub-modules II. Ibn AL-Haitham Journal For Pure and Applied Sciences, Baghdad, Iraq., v. 26, n. 1, p. 292–302, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/537. Acesso em: 29 mar. 2025.