1. ETSI ETS GSM 02.09, “European Digital Cellular Telecommunications System (Phase 2); Security Aspects,” Version 4.2.4, September 1994.
2. ETSI ETS 3000175-7, “DECT Common Interface, Part 7: Security Features,” October 1992.
3. UMTS Forum, “A regulatory framework for UMTS,” Report no. 1, 1997.
4. ETSI ETR 33.20, “Security Principles for UMTS,” Draft 1, 1997.
5. ITU, “Security Principles for Future Public Land Mobile Telecommunication Systems,” Rec. ITU-R M. 1998.