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Kiyohiro IKEDA, Tatsuhito KONO, Takashi AKAMATSU, Akito YANAGIMOTO, Shunji YAMAKI. "SYMMETRY-BREAKING BIFURCATION OF A CORE-PERIPHERY MODEL OF MANY CITIES: GROUP-THEORETIC APPROACH." Doboku Gakkai Ronbunshuu D (2007) 553-566