http://www.insight.co.kr/view.php?ArtNo=6630

http://www.pressian.com/news/article.html?no=85728

http://www.huffingtonpost.kr/2015/01/17/story_n_6490728.html?1421460536

http://media.daum.net/economic/others/newsview?newsid=20150116114905756

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