http://www.sankei.com/smp/world/news/151205/wor1512050042-s.html
http://mainichi.jp/articles/20160115/k00/00m/020/115000c
http://www3.nhk.or.jp/news/html/20160115/k10010372401000.html
http://headlines.yahoo.co.jp/hl?a=20160115-00000001-jij_afp-int.view-000
http://mw.nikkei.com/sp/#!/article/DGXLASDG13H3L_T10C16A1CC0000/