Sridhara, G., Rajesh Kanna, and H.L. Parashivamurthy. “New Bounds for Distance Energy of A Graph”. Journal of the Indonesian Mathematical Society 26, no. 2 (July 10, 2020): 213–223. Accessed April 20, 2024. http://jims-a.org/index.php/jimsa/article/view/789.