Jeffrey Oon, Daniel Aiman Oon, and Mahathir Mohamad. “Comparative Analysis of Numerical Methods for Earth Orbit Calculations in Celestial Mechanics”. Enhanced Knowledge in Sciences and Technology, vol. 5, no. 2, Dec. 2025, pp. 38-46, https://publisher.uthm.edu.my/periodicals/index.php/ekst/article/view/18404.