http://www.ipa.go.jp/security/txt/2013/11outline.html

http://news.goo.ne.jp/article/jiji/politics/jiji-131107X399.html?fr=rk

http://dot.asahi.com/news/domestic/2013110600030.html

http://www.47news.jp/CN/201311/CN2013110801001300.html

http://www3.nhk.or.jp/news/html/20131108/k10015893891000.html

http://www.asahi.com/articles/TKY201311070490.html