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Ikeda, Kiyohiro and Akamatsu, Takashi and Kono, Tatsuhito (2009): Spatial Period-Doubling Agglomeration of a Core-Periphery Model with a System of Cities.
Ikeda, Kiyohiro and Murota, Kazuo and Takayama, Yuki and Kamei, Motohiro (2017): Hexagonal distributions of cities in Southern Germany and Eastern USA: Group-theoretic spectrum analysis.
Ikeda, Kiyohrio and Onda, Mikihisa and Takayama, Yuki (2017): Bifurcation theory of a square lattice economy: Racetrack economy analogy in an economic geography model.