Pirzada, Shariefuddin, and Saleem Khan. “On the Sum of Distance Laplacian Eigenvalues of Graphs”. Tamkang Journal of Mathematics 54, no. 1 (February 1, 2023): 83–91. Accessed April 14, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4120.