http://kr.wsj.com/posts/2012/10/30/%EC%9A%B0%EB%A6%AC%EA%B0%80-%EB%AA%B0%EB%9E%90%EB%8D%98-%EC%99%84%EB%B2%BD%EC%A3%BC%EC%9D%98%EC%9E%90%EC%9D%98-%EB%B9%84%EB%B0%80/

http://plus.hankyung.com/apps/newsinside.view?aid=201503120635A&category=AA006&isSocialNetworkingService=yes

http://www.itmagnet.co.kr/data-analysis-kpi/?utm_campaign=contents-mkt_ga2&utm_source=facebook&utm_medium=social&utm_content=data-analysis-kpi

http://ppss.kr/archives/38156

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