“Measuring and Explaining the Complexity of Left-Right Perceptions of Political Parties.” (with Royce Carroll) Electoral Studies 71 (2021) (accepted, forthcoming).
 The Logic of Delegation and Institutional Contexts: Ministerial Selection under Mixed-Member Systems in Japan. Asian Journal of Comparative Politics 4 (4), (2019), 303-329.
 Measuring and Comparing Party Ideology and Heterogeneity. (with Royce Carroll) Party Politics 25 (2), (2019) 245-256.
 Polarization and Ideological Congruence between Parties and Supporters in Europe. (with Royce Carroll) Public Choice 176, 1–2, (2018) 247–265.
 Explaining Citizen Perceptions of Party Ideological Positions: The Mediating Role of Political Contexts. (with Royce Carroll) Electoral Studies 51 (2018) 14–23.
 The Impact of Bicameralism on the Disproportionality of Cabinet Portfolio Allocation. Japanese Political Science Review 3 (2016), 127–145.
-Explaining Party Ideological Cohesion: District Partisanship, Electoral Competition, and Ideological Deviation in Japan’s Mixed-Member Systems, 2003-13
-Does Intra-District Polarization Cause Party Polarization in Congress?
-Intra-Party Dynamics and Preferences for Electoral System Change in Japan
-The Impact of Divided Government on Bill Introduction in State Legislatures in the US (with Nick Lin)
-The Effect of Bicameral Ideological Incongruence on the Legislative Productivity of the US State Legislatures
(More projects will be added very soon.)