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http://kostat.go.kr/portal/korea/kor_nw/2/1/index.board?bmode=read&aSeq=356426
. Accessed 21 Jun 2017.
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http://kostat.go.kr/portal/korea/kor_nw/2/1/index.board?bmode=read&aSeq=356426
. Accessed 6 Nov 2017.
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http://www.oecd.org/pensions/pensionsataglance.htm
. Accessed 20 Jun 2017.
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http://www.law.go.kr/lsInfoP.do?lsiSeq=180478&efYd=20160728#0000
. Accessed 21 Jun 2017.
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www.kowdicontest.org/admin/filedownload.asp?idx=49&boardcode=pds1&dtp=1
. Accessed 21 Jun 2017.