Mahto, Dipo, Brajesh Jha, Murlidhar Singh, and Promod Jha. “Characteristics of Non-Spinning Black Holes”. Current Journal of Applied Science and Technology 4, no. 29 (August 1, 2014): 4136-4147. Accessed August 21, 2019. http://www.journalcjast.com/index.php/CJAST/article/view/6195.