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://doi.ieeecomputersociety.org/10.1109/HICSS.2004.1265501 db/conf/hicss/hicss2004-8.html#LeeKP04