The maximum girth and minimum circumference of graphs with prescribed radius and diameter. - Pu Qiao; Xingzhi Zhan (Discret. Math., 2018)

On Vertex Types of Graphs. - Pu Qiao; Xingzhi Zhan (Graphs Comb., 2018)

A Turán problem on digraphs avoiding distinct walks of a given length with the same endpoints. - Zejun Huang; Zhenhua Lyu; Pu Qiao (Discret. Math., 2019)

The Largest Graphs with Given Order and Diameter: A Simple Proof. - Pu Qiao; Xingzhi Zhan (Graphs Comb., 2019)

Pairs of a tree and a nontree graph with the same status sequence. - Pu Qiao; Xingzhi Zhan (Discret. Math., 2020)

The minimum number of Hamilton cycles in a Hamiltonian threshold graph of a prescribed order. - Pu Qiao; Xingzhi Zhan (J. Graph Theory, 2020)