1. Camarillo, G., & Garcia-Martin, M.-A. (2004). The 3G IP multimedia subsystem (IMS): merging the Internet and the Cellular Worlds. Hoboken: Wiley.
2. 3GPP TS 31.103: Characteristics of the IP multimedia services identity module (ISIM) application.
3. RFC 3310 (2002). Hypertext transfer protocol (HTTP) digest authentication using authentication and key agreement (AKA).
4. 3GPP TS 133.220. Generic authentication architecture (GAA). Generic bootstrapping architecture.
5. Sher, M., & Magedanz, T. (2006). Secure access to IP multimedia services using generic bootstrapping architecture (GBA) for 3G & beyond mobile networks. Q2SWinet 2006: pp. 17–24.