http://www.itmedia.co.jp/news/articles/1306/04/news118.html

http://www.news-postseven.com/archives/20130606_192040.html

http://www.chugoku-np.co.jp/News/Tn201306070043.html

http://matimura.cocolog-nifty.com/matimulog/2013/06/book-d0fe.html#more

http://www.dot-jp.or.jp/contents.php?g_id=52

http://news.goo.ne.jp/article/dot/nation/dot-2013060400055.html