KAMIL, Mubarak M. Crossed modules of Bigroups and BiCrossed modules of Bigroups. University of Thi-Qar Journal, [S. l.], v. 10, n. 1, p. 1–10, 2019. Disponível em: https://jutq.utq.edu.iq/index.php/main/article/view/10. Acesso em: 9 oct. 2025.