"Aggregate Accuracy under Majority Rule with Heterogeneous Cost Functions," (joint with Minoru Kitahara), 2006, Economics Bulletin, 4,25, 1～8.
"Condorcet Jury Theorem or Rational Ignorance", (joint with Minoru Kitahara), 2008, Journal of Public Economic Theory, 10 (2), 281～300.
"Majority Rule or Delegation?: Normal Noise Case", (joint with Minoru Kitahara), 2008, Economics Letters, 99 (1), 36～39.
"Uniqueness of Nash equilibria in quantum Cournot duopoly game," (joint with Yohei Sekiguchi and Takashi Sato), 2010, J. Phys. A: Math. Theor. 43 145303.
"Existence of equilibria in quantum Bertrand-Edgeworth duopoly game," 2010, (joint with Yohei Sekiguchi and Takashi Sato) arXiv:1003.4649v1.
