Links
[1] http://www.sdi.re.kr/%23
[2] http://facebook.com/sharer.php?u=http%3A%2F%2Fwww.sdi.re.kr%2Fnode%2F40395&t=%EC%84%9C%EC%9A%B8%20%ED%94%84%EB%A1%9C%ED%95%84
[3] http://twitter.com/intent/tweet?url=http%3A%2F%2Fwww.sdi.re.kr%2Fnode%2F40395&text=%EC%84%9C%EC%9A%B8%20%ED%94%84%EB%A1%9C%ED%95%84
[4] http://www.sdi.re.kr/taxonomy/term/15659
[5] http://www.sdi.re.kr/si_download/40395/6363
[6] http://www.sdi.re.kr/studies_on/15659