http://gigazine.net/news/20120924-emoticon-celebrates-it-30th-birthday/

http://news.goo.ne.jp/article/toyokeizai/business/toyokeizai-20120927-02.html?fr=rk

http://www.challenge25.go.jp/green/contest2012_ex.html

http://www.asahi.com/national/update/0928/OSK201209280235.html

http://kanz.jp/hanrei/detail/82557/

http://news.goo.ne.jp/article/asahi/nation/K2012092802170.html

http://news.goo.ne.jp/article/sankei/nation/snk20120928125.html

http://www.asahi.com/obituaries/update/0928/TKY201209280375.html