http://ima.goo.ne.jp/column/article/962.html

http://www.excite.co.jp/News/society_g/20140529/Jiji_20140529X786.html

http://headlines.yahoo.co.jp/hl?a=20140531-00000005-ryu-oki

http://www.asahi.com/articles/DA3S11166302.html

http://www.kobe-np.co.jp/news/kyouiku/201405/0007007894.shtml?fb_action_ids=754756114577121&fb_action_types=og.recommends