Spatial Cournot Competition and Economic Welfare: A Note. Regional Science and Urban Economics 35, 658-70, 2005 (with Toshihiro Matsumura).
Partial Agglomeration or Dispersion in Spatial Cournot Competition. Southern Economic Journal 72, 224-35, 2005 (with Toshihiro Matsumura and Takao Ohkawa).
Economic Welfare in Delivered Pricing Duopoly: Bertrand and Cournot, Economics Letters 89, 112-19, 2005 (with Toshihiro Matsumura).
Cournot and Bertrand in Shipping Models with Circular Markets, Papers in Regional Science 85(4), 585-598, 2006 (with Toshihiro Matsumura).
A Noncooperative Shipping Cournot Duopoly with Linear-Quadratic Transport Costs and Circular Space, Japanese Economic Review 59(4), 498-518, 2008 (with Toshihiro Matsumura).
Equilibrium Location and Economic Welfare in Delivered Pricing Oligopoly, Economics Bulletin 29(2), 760-768, 2009 (with Toshihiro Matsumura).
Privatization Waves, Manchester School 78(6), 609-625, 2010 (with Toshihiro Matsumura).
Sequential Mergers with Differing Differentiation Levels, Australian Economic Papers, 238-251, 2009. (with Takeshi Ebina)
Mixed Oligopoly and Spatial Agglomeration in Quasi-Linear City, Economics Bulletin 29(4), 2722-2729, 2009 (with Takeshi Ebina and Toshihiro Matsumura).
Collusive Behavior under a Leniency Program, Journal of Economics 101(2), 169-183, 2010. (with Ikuo Ishibashi)
Spatial Cournot Equilibria in a Quasi-linear City, Papers in Regional Science 90(3), 613-628, 2011. (with Takeshi Ebina and Toshihiro Matsumura).
Endogenous Product Differentiation and Product R&D in Spatial Cournot Competition (with Takeshi Ebina), Annals of Regional Science, 49(1), 117-133, 2012.
A unidirectional Hotelling model revisited (with Takeshi Ebina), Economics Bulletin, 32(4), 2870-2875, 2012.
Endogenous Flexibility in Flexible Manufacturing System (with Toshihiro Matsumura), Bulletin of Economic Research, 67(1), 1-13, 2015.
Product Differentiation and Entry Timing in a Continuous Time Spatial Competition Model (with Takeshi Ebina and Noriaki Matsushima), European Journal of Operational Research, 247(3), 904-913, 2015.
Sequential mergers under general symmetric product differentiation with four firms (with Takeshi Ebina), Asia-Pacific Journal of Accounting & Economics, 23, 306-326, 2016.