Choice number of some complete multi-partite graphs. - Hikoe Enomoto; Kyoji Ohba; Katsuhiro Ota; Junko Sakamoto (Discret. Math., 2002)

On chromatic-choosable graphs. - Kyoji Ohba (J. Graph Theory, 2002)

Choice Number of Complete Multipartite Graphs with Part Size at Most Three. - Kyoji Ohba (Ars Comb., 2004)

Looseness and independence number of triangulations on closed surfaces. - Atsuhiro Nakamoto; Seiya Negami; Kyoji Ohba; Yusuke Suzuki (Discuss. Math. Graph Theory, 2016)