1. Research on Japanese urban system;Abe,1991
2. Five bell shapes in development;Alonso;Papers of the Regional Science Association,1980
3. A ‘reciprocal dumping’ model of international trade;Brander;Journal of International Economics,1983
4. Census of Manufactures, 1955–1990, Ministry of Interational Trade and Industry, in Japanese.
5. Regional structure of income and finance;Chiba,1988