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- http://www.nikkeibp.co.jp/style/trend/sense/ogasawara/061116_3rd/
- http://business.nikkeibp.co.jp/article/skillup/20060927/110670/
- http://business.nikkeibp.co.jp/article/skillup/20061106/113098/
- http://nikkeibp.jp/style/secondstage/jinsei/newsisan_061108.html
- http://www.nikkeibp.co.jp/style/biz/skillup/leader/061116_7th/