Brza, Mohamad Ali, and Mariwan Ahmed Rasheed. “N-Body Simulation for Dark Matter Clustering at Different Epochs of the Universe”. Al-Nahrain Journal of Science 16, no. 1 (March 1, 2013): 84-90. Accessed August 29, 2021. https://anjs.edu.iq/index.php/anjs/article/view/716.