Maisalatee, A. U., M. M. Azos, and I. I. Ewa. “Complete Einstein’s Equations of Motion for Test Particles Exterior to Spherical Massive Bodies Using a Varying Potential”. International Astronomy and Astrophysics Research Journal 3, no. 1 (April 7, 2021): 43–53. Accessed September 5, 2026. https://www.journaliaarj.com/index.php/IAARJ/article/view/37.