Automorphism group of a graph related to zero-divisor graphs. - Songnian Xu; Dein Wong; Yan Wang; Fenglei Tian (Discret. Appl. Math., 2025)

Line graphs with the largest eigenvalue multiplicity. - Wenhao Zhen; Dein Wong; Songnian Xu (Discret. Math., 2025)

A characterization of graphs with two types of eigenvalue multiplicities equal to n-d-1. - Songnian Xu; Jinxing Zhao (Discret. Appl. Math., 2026)