Kita no sekai isan, Shirakami Sanchi no rekishi gakuteki kenkyūSeiichi Hasegawa · First published 2014Open the Tome
Hanryō ni okeru shokusei keikan no fukugen to sono hen'yōSeiichi Hasegawa · First published 2009Open the Tome
Mori Arinori ni okeru kokuminteki shutai no sōshutsuSeiichi Hasegawa · First published 2007Open the Tome
