Abbass HH, Kadhim SA-H, Battor AH. On Normal Subgroups Lattice of Dihedral Group. J. Al-Qadisiyah Comp. Sci. Math. [Internet]. 2020 Mar. 11 [cited 2024 Nov. 23];12(1):Math Page 83– 95. Available from: https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/675