Aali J. Mohammed, A., عبد, M. Abd Fathi, and منال. “On Crossed Modules and Crossed Homomonphisms”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 5, no. 2, June 2025, pp. 47-58, https://rjps.uomosul.edu.iq/index.php/csmj/article/view/19932.