http://www.itmedia.co.jp/news/articles/0909/28/news040.html

http://www.itmedia.co.jp/news/articles/0707/05/news018.html

http://it.nikkei.co.jp/internet/news/index.aspx?n=MMITba000011062007

http://internet.watch.impress.co.jp/cda/news/2006/04/28/11840.html

http://www.mainichi-msn.co.jp/today/news/20060330k0000m040153000c.html