http://ryukyushimpo.jp/news/page-357.html

http://www.nikkansports.com/sports/news/p-sp-tp0-20130514-1126831.html

http://gigazine.net/news/20130517-thing-makes-us-happy/

http://sankei.jp.msn.com/west/west_life/news/130518/wlf13051818010029-n1.htm

http://www.47news.jp/CN/201305/CN2013051701002315.html

http://jp.wsj.com/article/JJ12474496611306554651318982235960924956845.html