http://itpro.nikkeibp.co.jp/article/NEWS/20070130/260091/
http://www.nttdocomo.co.jp/info/news_release/page/20070131.html
http://enterprise.watch.impress.co.jp/cda/security/2007/01/24/9493.html
http://www.nikkeibp.co.jp/news/biz07q1/523613/
http://www.microsoft.com/japan/presspass/detail.aspx?newsid=2947
http://japanese.engadget.com/2007/01/23/google-ebook-agenda/
http://www.asahi.com/digital/nikkanko/NKK200701240016.html
http://internet.watch.impress.co.jp/cda/news/2007/01/24/14562.html
http://internet.watch.impress.co.jp/cda/news/2007/01/23/14541.html