Links
[1] http://www.sdi.re.kr/%23
[2] http://facebook.com/sharer.php?u=http%3A%2F%2Fwww.sdi.re.kr%2Fnode%2F67865&t=%EC%A0%9C24%EA%B6%8C%20%EC%A0%9C4%ED%98%B8
[3] http://twitter.com/intent/tweet?url=http%3A%2F%2Fwww.sdi.re.kr%2Fnode%2F67865&text=%EC%A0%9C24%EA%B6%8C%20%EC%A0%9C4%ED%98%B8
[4] http://www.sdi.re.kr/taxonomy/term/27408
[5] http://www.sdi.re.kr/si_download/67865/37238
[6] http://www.sdi.re.kr/studies_on/27408