2021. "The impact of election outcome on internal political efficacy: The role of contextual factors." Electoral Studies. Volume 74. DOI: doi.org/10.1016/j.electstud.2021.102406

2015. “The Effect of Direct Democracy on Political Efficacy: The Evidence from Panel Data Analysis.” Japanese Journal of Political Science, No.16 (1): 53-68 (http://journals.cambridge.org/article\_S1468109914000383)

2014. “Reconsidering the Measurement of Political Efficacy in Japan: Validation of Indices and its Effect on Political Participation.”  Journal of Law and Political Studies, No.100: 121-154, in Japanese.

2014. “An Analysis for Quality of Democracy in Korea (1).”  Journal of Law, Politics and Sociology, No.86 (10):  1-36, co-author: Yoshiaki Kobayashi, in Japanese.

2014. “An Analysis for Quality of Democracy in Korea (2).”  Journal of Law, Politics and Sociology, No.86 (11):  1-35, co-author: Yoshiaki Kobayashi, in Japanese.

2013. “The Democratic System and Political Efficacy: An Analysis of CSES Data.” Japanese Journal of Electoral Studies, No.29 (2) (invited paper)

2012. “Quantitative Analysis of Political Efficacy: Utilizing Public Opinion Survey Data in Japan, the US. and South Korea.”  Journal of Law and Political Studies, No.93: 135-166, in Japanese.

2014. “Comparative study of Malfunctioning Democracy -- The case of United States, Japan, and Korea.” Keio University Press. co-author: Yoshiaki Kobayashi, Yosuke Okada, Hidekuni Washida, in Japanese.

2016. “Cohort effects and Political Efficacy.” In Empirical Analysis of Representative Democracy, ed. Yoshiaki Kobayashi. Tokyo: Bokutaku, in Japanese.

2016. “Election outcomes and Political Efficacy.” In Empirical Analysis of Representative Democracy, ed. Yoshiaki Kobayashi. Tokyo: Bokutaku, in Japanese.