Fajrin, Muhammad, Hakim Luthfi Malasan, and Evan Irawan Akbar. “Optical Spectroscopy and Photoionization Model of Planetary Nebula NGC 6572”. Journal of Mathematical and Fundamental Sciences 55, no. 2 (January 11, 2024): 129-141. Accessed October 20, 2025. https://journals.itb.ac.id/index.php/jmfs/article/view/21621.