http://www.sankei.com/economy/news/151218/ecn1512180027-n1.html

http://news.livedoor.com/article/detail/10972843/

http://gendai.ismedia.jp/articles/-/46857

http://www.nichibenren.or.jp/activity/document/statement/year/2015/151218_2.html http://mainichi.jp/articles/20151217/ddm/041/040/105000c http://www.sankei.com/affairs/news/151217/afr1512170008-n1.html

http://headlines.yahoo.co.jp/hl?a=20151219-00000074-san-soci http://headlines.yahoo.co.jp/hl?a=20151219-00000075-san-soci