http://m.itdaily.kr/news/articleView.html?idxno=8370

http://ppss.kr/archives/43706

http://www.huffingtonpost.kr/2014/03/14/-_n_4961046.html?ncid=fcbklnkkrhpmg00000001

http://biz.chosun.com/site/data/html_dir/2015/04/24/2015042401473.html

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