Yufa Shen Wenjie He Guoping Zheng Yanning Wang Lingmin Zhang On choosability of some complete multipartite graphs and Ohba's conjecture. 136-143 2008 308 Discrete Mathematics 1 http://dx.doi.org/10.1016/j.disc.2007.03.059 db/journals/dm/dm308.html#ShenHZWZ08