Iqbal, Muhammad J, and Jawaid Quamar. “PLANETARY ORBITS IN AxISYMMETRIC VACUUM GRAVITATIONAL FIELDS”. Biological Sciences - PJSIR 46, no. 3 (June 23, 2003): 148–150. Accessed November 24, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/1614.