Bhattacharya, Amitava, Shmuel Friedland, and Uri N. Peled. “On the First Eigenvalue of Bipartite Graphs”. The Electronic Journal of Combinatorics 15, no. 1 (November 30, 2008): #R144. Accessed April 12, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v15i1r144.