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WikiPedia: GS_Group http://www.gs.co.kr/ http://www.gsconst.co.kr/en/ http://www.gsholdings.co.kr/eng/about/status/histo... http://eng.krx.co.kr/por_eng/m2/m2_1/m2_1_1/JHPENG... http://eng.krx.co.kr/por_eng/m2/m2_1/m2_1_1/JHPENG... https://books.google.com/?id=c6DMEAsSYzwC&pg=PA105... https://www.gs.co.kr/en/ https://web.archive.org/web/20150924040909/http://... https://web.archive.org/web/20190824231858/http://...