By JEON Hyo-Chan, Samsung Economic Research Institute, Nov 25th 2008 and March 11th 2009.
http://www.seriworld.org/01/wldContV.html?&mn=B&mncd=0101&key=20061121000001&pubkey=20061121000001&seq=20061121000001&kdy=E5JjH5a6 AND http://www.koreantranslation.com/REPOSITORY/TheEconomicsofEnglish/tabid/1552/Default.aspx