On r-hued coloring of product graphs. - Lingmei Liang; Fengxia Liu; Baoyindureng Wu (RAIRO Oper. Res., 2022)

On list r-hued coloring of outer-1-planar graphs. - Lingmei Liang; Fengxia Liu; Hong-Jian Lai (Appl. Math. Comput., 2023)