Poudel, PC, and U Khanal. “Estimation of Mass, Cosmological Constant and Kerr Parameter of Different Galaxies Using Geodesic Motion in Kerr-De Sitter Space-Time”. Scientific World 10, no. 10 (September 20, 2012): 1–6. Accessed May 2, 2024. https://www.nepjol.info/index.php/SW/article/view/6852.