El-Mongy, Sayed. “A Theory for Galaxy Formation: Innovative Model for Evolution of Galaxies As a Function in the Initial Cloud 2π and 4π Geometry and Acceleration”. JOURNAL OF ADVANCES IN PHYSICS 20 (September 3, 2022): 192–300. Accessed May 8, 2024. https://rajpub.com/index.php/jap/article/view/9280.