On Approximation Algorithms for Coloring k-Colorable Graphs. - Xuzhen Xie; Takao Ono; Tomio Hirata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)

New Bounds for the Nearly Equitable Edge Coloring Problem. - Xuzhen Xie; Mutsunori Yagiura; Takao Ono; Tomio Hirata; Uri Zwick (ISAAC, 2007)

An Efficient Algorithm for the Nearly Equitable Edge Coloring Problem. - Xuzhen Xie; Mutsunori Yagiura; Takao Ono; Tomio Hirata; Uri Zwick (J. Graph Algorithms Appl., 2008)