http://m.insight.co.kr/article.php?ArtNo=35725

http://www.heartsaying.com/archives/896

http://m.wikitree.co.kr/main/news_view.php?id=196638#read

http://m.wikitree.co.kr/main/news_view.php?id=196638

http://m.blog.naver.com/barona8258/220549891834

http://m.blog.naver.com/barona8258/220569507133

http://www.slideshare.net/mobile/jinkwonlee52/frontend-46605098