Links
[1] https://www.si.re.kr/%23
[2] http://facebook.com/sharer.php?u=https%3A%2F%2Fwww.si.re.kr%2Fnode%2F63148&t=%EC%84%B8%EA%B3%84%EB%8F%84%EC%8B%9C%EB%8F%99%ED%96%A5%20%EC%A0%9C474%ED%98%B8
[3] http://twitter.com/intent/tweet?url=https%3A%2F%2Fwww.si.re.kr%2Fnode%2F63148&text=%EC%84%B8%EA%B3%84%EB%8F%84%EC%8B%9C%EB%8F%99%ED%96%A5%20%EC%A0%9C474%ED%98%B8
[4] https://www.si.re.kr/sites/default/files/vol_474_0.pdf
[5] https://www.si.re.kr/world_trends