with Koichi Kawabuchi: Getting Vaccine Policy Right: A global-standard comprehensive policy for Japan, Shakai Hoken Junpo (Social Insurance News) 2413-2414 (February 1, February 11, 2010), 14-20, 20-27 (in Japanese).
Political Parties and the Aging Society, in: Florian Coulmas (ed.): The Demographic Challenge. A Handbook about Japan, 2008.
The Politics of Japan's Long Term Care Insurance System, in: Harald Conrad and Ralph Luetzeler (eds.): Aging and Social Policy. A German-Japanese Comparison, Munich 2003, Iudicium, 89-121.