http://www.gukjenews.com/news/articleView.html?idxno=67560

http://news1.kr/articles/1472690

http://www.eto.co.kr/news/outview.asp?Code=20131231104546243&ts=85347

http://www.zdnet.co.kr/news/news_view.asp?artice_id=20131231100324&type=xml

http://www.zdnet.co.kr/column/column_view.asp?artice_id=20131230090341&type=xml

http://www.dt.co.kr/contents.html?article_no=2013123102010531600003

http://news.inews24.com/php/news_view.php?g_serial=793918&g_menu=020310&rrf=nv

http://www.dt.co.kr/contents.html?article_no=2014010202010431749001

http://www.econovill.com/archives/146194

http://www.fnnews.com/view?ra=Sent1101m_View&corp=fnnews&arcid=201312310100328090017275&cDateYear=2013&cDateMonth=12&cDateDay=31