The Extremal Matching Energy of Graphs. - Shengjin Ji; Hongping Ma (Ars Comb., 2014)

On the minimal energy of conjugated unicyclic graphs with maximum degree at most 3. - Hongping Ma; Yongqiang Bai; Shengjin Ji (Discret. Appl. Math., 2015)

Solutions to unsolved problems on the minimal energies of two classes of trees. - Yongqiang Bai; Hongping Ma (Appl. Math. Comput., 2016)

Flow-contractible configurations and group connectivity of signed graphs. - Jiaao Li; Rong Luo; Hongping Ma; Cun-Quan Zhang (Discret. Math., 2018)

Linear list r-hued coloring of sparse graphs. - Hongping Ma; Xiaoxue Hu; Jiangxu Kong; Murong Xu (Discret. Math. Algorithms Appl., 2018)

Prime-valent symmetric graphs admitting alternating transitive group. - Jing Jian Li; Jing Yang; Ran Ju; Hongping Ma (Appl. Math. Comput., 2021)