http://www.asiatoday.co.kr/news/view.asp?seq=917983

http://www.munhwa.com/news/view.html?no=2014010201031627109003

http://www.dt.co.kr/contents.html?article_no=2014010202019976798005

http://news.itimes.co.kr/news/articleView.html?idxno=509084

http://www.korea.kr/policy/pressReleaseView.do?newsId=155936878

http://www.newsis.com/ar_detail/view.html?ar_id=NISX20140102_0012634521&cID=10201&pID=10200

http://www.itworld.co.kr/news/85352

http://news.mtn.co.kr/newscenter/news_viewer.mtn?gidx=2013123116261761986

http://news.donga.com/3/all/20140101/59916724/1

http://www.etoday.co.kr/news/section/newsview.php?idxno=846003