Bounds for the matching number, the edge chromatic number and the independence number of a graph in terms of rank. - Long Wang 013; Dein Wong (Discret. Appl. Math., 2014)

Maximum Estrada index of bicyclic graphs. - Long Wang 013; Yi-Zheng Fan; Yi Wang (Discret. Appl. Math., 2015)

Automorphisms of the zero-divisor graph of the ring of all n×n matrices over a finite field. - Long Wang 013 (Discret. Math., 2016)

Characterization of graphs with given order, given size and given matching number that minimize nullity. - Long Wang 013 (Discret. Math., 2016)

Proof of a conjecture on the nullity of a graph. - Long Wang 013; Xianya Geng (J. Graph Theory, 2020)

Graphs with nullity 2c(G)+p(G)-1. - Long Wang 013; Xianwen Fang; Xianya Geng (Discret. Math., 2022)