Yūichi Hasegawa

Yūka shōkenhō tsūron

Yūka shōkenhō tsūron

2000

Yūin shōkenhō no kenkyū

Yūin shōkenhō no kenkyū

1989

Tegata kōben no kenkyū

Tegata kōben no kenkyū

1984

Tegata hōri no kihon mondai

Tegata hōri no kihon mondai

1976