1. 3GPP. (2010). 3G security; Access security for IP-based services. TS 33203 Release 9.
2. 3GPP. (2010). 3GPP system architecture evolution (SAE); Security aspects of non-3GPP accesses. TS 33402 Release 9.
3. 3GPP. (2010). IP multimedia subsystem (IMS) stage 2. TS 23228 (Release 8).
4. 3GPP. (2011). General packet radio service (GPRS) enhancements for evolved universal terrestrial radio access network (E-UTRAN) access. TS 23401 (Release 9).
5. 3GPP. (2011). IP multimedia subsystem (IMS) service continuity; Stage 2. TS 23237 0 (Release 10).