Siagian, R. C.; Arip Nurahman; Goldberd Harmuda Duva Sinaga; Reza Ariefka; Pandu Pribadi. Exploring Celestial Object Characteristics: An In-Depth Analysis of Quasars, Stars, and White Dwarfs Using the Sloan Digital Sky Survey (SDSS) Dataset. timeinphys 2024, 2, 1-16.