Links
[1] http://www.sdi.re.kr/%23
[2] http://facebook.com/sharer.php?u=http%3A%2F%2Fwww.sdi.re.kr%2Fnode%2F37961&t=%EB%AA%A9%20%EC%B0%A8
[3] http://twitter.com/intent/tweet?url=http%3A%2F%2Fwww.sdi.re.kr%2Fnode%2F37961&text=%EB%AA%A9%20%EC%B0%A8
[4] http://www.sdi.re.kr/taxonomy/term/15646
[5] http://www.sdi.re.kr/si_download/37961/6201
[6] http://www.sdi.re.kr/studies_on/15646