-"Company's training policy and continuous hiring of new high school graduates: What are the conditions on which companies continue to hire new high school graduates?" joint with Y. Sano and H. Sato, Japanese Journal of Labour Studies, Vol. 50, No.11, 2006, pp63-79. (in Japanese)

-"What Do Unions Do in Japan?," joint with D. Kawaguchi, Graduate School of Economics and Institute of Economic Research, Hitotsubashi University, COE/RES Discussion Paper Series, 2006, No. 171.

-"What Influences Workers in Deciding to Support Unions?: Evidence from Japan - Focus on Workers' Understanding of Their Rights," joint with H. Sato, Japan Labor Review, Vol. 3, No. 2, 2006, pp91-115.

-"Labour Demand for New High School Graduates in Japan," Japan Labor Review, Vol. 2, No. 3, 2005, pp49-72.

-"What Influences on Non-union Employees’ Attitude toward Unionization?: The Role of Knowledge of the Rights of Labor," joint with H. Sato, Japanese Journal of Labour Studies, Vol. 48, No.11, 2004, pp54-70. (in Japanese)

-"The Estimation of the Elasticities of Complementarity between Standard Employees and Nonstandard Employees in Japan: Focusing on Part-timers", Japanese Journal of Labour Studies, Vol. 45, No.9, 2003, pp17-30. (in Japanese)