http://www.huffingtonpost.kr/2015/04/04/story_n_7002326.html?1428111482

http://hr.eduwill.net/news/articleView.html?idxno=1119

http://kr.wsj.com/posts/2015/03/17/%EB%8B%A4%EC%9D%8C-%ED%87%B4%EC%82%AC%EC%9E%90%EB%8A%94-%EB%88%84%EA%B5%AC-%EB%AF%B8-%EA%B8%B0%EC%97%85%EB%93%A4-%EB%8D%B0%EC%9D%B4%ED%84%B0-%EB%B6%84%EC%84%9D%EC%9C%BC%EB%A1%9C/

http://slownews.kr/36378

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