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4. 5) http://www.ktr.mlit.go.jp/ktr_content/content/000043569.pdf . (in Japanese)
5. 6) Technical Committee on Measures Against Liquefaction in Urayasu City : Report on measures against liquefaction in Urayasu City, 2012. (in Japanese) http://www.city.urayasu.chiba.jp/secure/26052/lasthoukoku01.pdf