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http://www.chuo-u.ac.jp/common_d/uploads/2015/11/chuovisoon20151109-2.pdf?1447079381386

http://headlines.yahoo.co.jp/hl?a=20151116-00000089-jij-soci

http://headlines.yahoo.co.jp/hl?a=20151116-00050111-yom-soci