http://gigazine.net/news/20130604-wri-pe/

http://www.excite.co.jp/News/odd/Reuters_newsml_TYE954010.html

http://www.u-presscenter.jp/modules/bulletin/index.php?page=article&storyid=5313#.Ua8w8ZwYaSo

http://mainichi.jp/area/news/20130530ddn012040029000c.html

http://sankei.jp.msn.com/affairs/news/130604/trl13060419100001-n1.htm

http://www3.nhk.or.jp/news/html/20130605/k10015081841000.html