Ahmed AK, Taha AS, Kadhem AA. Identify the differences between ordinary and barred spiral galaxies, NGC 2649 and NGC 4662 for examples. Iraqi Journal of Science [Internet]. 2024 Nov. 15 [cited 2025 Dec. 7];65(10(SI):6197-204. Available from: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12525