http://zasshi.news.yahoo.co.jp/article?a=20131227-00000018-pseven-life

http://www3.nhk.or.jp/news/html/20131230/k10014203721000.html

http://www.asahi.com/articles/ASF0TKY201312290105.html

http://ameblo.jp/mahoshoshi-ai/entry-11732551163.html

http://news.goo.ne.jp/article/yomiuri/nation/20131228-567-OYT1T00595.html