Li, Hui Shu, and Hong Hai Li. “A Note on the Least (normalized) Laplacian eighva;Ue of Signed Graphs”. Tamkang Journal of Mathematics 47, no. 3 (September 30, 2016): 271–278. Accessed December 3, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/1942.