http://www.eto.co.kr/news/outview.asp?Code=20131223182154960&ts=75709

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http://www.hankyung.com/news/app/newsview.php?aid=2013122545971

http://it.donga.com/16922/

http://www.ittoday.co.kr/news/articleView.html?idxno=42379

http://www.bloter.net/archives/174871

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