1. 3GPP 2005 3GPP System to Wireless Local Area Network (WLAN) Interworking: Systems Description
2. 3GPP 2008 Feasibility Study on Multimedia Session Continuity
3. 3GPP 2009 Architecture Enhancements for Non-3GPP Accesses
4. Aboba B Simon D 1999 RFC 2716, Internet Engineering Task Force
5. Aboba B Blunk L Vollbrecht J Carlson J Levkowetz E 2004 RFC 3748, Internet Engineering Task Force