On the uniqueness of Bertrand equilibrium. - Daisuke Hirata; Toshihiro Matsumura (Oper. Res. Lett., 2010)

Collusion, agglomeration, and heterogeneity of firms. - Toshihiro Matsumura; Noriaki Matsushima (Games Econ. Behav., 2011)

Randomized strategy equilibrium in the action commitment game with costs of leading. - Toshihiro Matsumura; Takeshi Murooka; Akira Ogawa (Oper. Res. Lett., 2011)