1. 3G Licensing (2006). NTT Corporation joins the W-CDMA Patent Licensing as a licensor. Press release, March 21.
2. Direct validation of citation counts as indicators of industrially important patents;Albert;Research Policy,1991
3. ARIB (1998). Japan's Proposal for Candidate Radio Transmission Technology on IMT-2000: W-CDMA, ARIB IMT-2000 Study Committee. Tokyo: Association of Radio Industries and Businesses. URL: 〈http://www.arib.or.jp/IMT-2000/Data/Proposal.pdf〉.
4. List of essential property rights (IPRs) for ARIB STD-T63, Version 1.00;ARIB,2000
5. ATIS (2005). ATIS patent information. Alliance for telecommunications industry solutions. Accessed November 2005. URL: 〈http://www.atis.org/tc/patpolicy.asp〉.