Qasim, Shahad M., and Hareth S. Mahdi. “Investigating the Color Distribution of Young and Old Galaxies Using Observations from SDSS”. Iraqi Journal of Science 65, no. 4 (April 30, 2024): 2344–2356. Accessed December 7, 2025. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/9640.