A sufficient condition for a planar graph to be class 1. - Weifan Wang 001; Yongzhu Chen (Theor. Comput. Sci., 2007)

Improper choosability of graphs of nonnegative characteristic. - Yongzhu Chen; Weiyi Zhu; Weifan Wang 001 (Comput. Math. Appl., 2008)

On the diameter of generalized Kneser graphs. - Yongzhu Chen; Yingqian Wang 001 (Discret. Math., 2008)

Diameters of uniform subset graphs. - Yongzhu Chen; Weifan Wang 001 (Discret. Math., 2008)

Edge choosability of planar graphs without 5-cycles with a chord. - Yongzhu Chen; Weiyi Zhu; Weifan Wang 001 (Discret. Math., 2009)