Javadi, Hossein, Farshid Forouzbakhsh, and Arezu Jahanshir. “Definition of Singularity Due to Newton’s Second Law Counteracting Gravity”. Scientific Journal of Pure and Applied Sciences 2, no. 3 (March 30, 2013): 116-124. Accessed April 24, 2024. http://www.sjournals.com/index.php/sjpas/article/view/989.