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3. Giaretta, Gerardo. Interactions between proxy mobile IPv6 (PMIPv6) and mobile IPv6 (MIPv6): Scenarios and related issues. No. RFC 6612. 2012;
4. S. Gundavelli, K. Leung, V. Devarapalli, K. Chowdhury, B. Patil. Proxy mobile IPv6. No. RFC 5213. 2008;
5. An improved smart card based authentication scheme for session initiation protocol;S Kumari;Peer-to-Peer Networking and Applications,2015