http://itunes.apple.com/jp/app/jumbo-calculator/id361121377?mt=8

http://www.itmedia.co.jp/news/articles/1202/28/news074.html

http://www.ringolab.com/note/daiya/2012/02/post-1599.html

http://www.ringolab.com/note/daiya/2012/02/post-1598.html

http://gigazine.net/news/20120222-nomophobia/

http://www.asahi.com/science/update/0228/TKY201202270655.html

http://mainichi.jp/select/jiken/news/20120228k0000e040245000c.html

http://headlines.yahoo.co.jp/hl?a=20120227-00000683-yom-soci

http://headlines.yahoo.co.jp/hl?a=20120228-00000014-kyt-l26

http://news.goo.ne.jp/article/jiji/nation/jiji-120228X105.html