http://internet.watch.impress.co.jp/docs/news/20140116_631007.html

http://gigazine.net/news/20140119-post-center-exam/

http://www.meti.go.jp/press/2013/01/20140117006/20140117006.html

http://www.jsda.or.jp/katsudou/public/bosyu/files/20130913_shushikosshishinnkyuu_JK.pdf

http://jsakano1009.cocolog-nifty.com/blog/2014/01/post-b7b3.html