Sang-Woo Lee Dan Jong Kim Myeong-Cheol Park Demand for Number Portability in the Korean Mobile Telecommunications Market: Contingent Valuation Approach. 2004 HICSS http://csdl.computer.org/comp/proceedings/hicss/2004/2056/08/205680216babs.htm db/conf/hicss/hicss2004-8.html#LeeKP04