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Political Parties and the Aging Society, en: Florian Coulmas (ed.): The Demographic Challenge. A Handbook about Japan, London 2008, Brill.

The Politics of Japan's Long Term Care Insurance System, en: Harald Conrad and Ralph Luetzeler (eds.): Aging and Social Policy. A German-Japanese Comparison, Múnich 2003, Iudicium, p.89-121.