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2. Cisco Systems (2008). Unified Communications Technology Overview. http://www.cisco.com/en/US/products/sw/voicesw/products_category_technologies_overview.html
3. Dr. Roy Fielding (2000). Published doctoral dissertation, Architectural Styles and the Design of Network-based Software Architectures, University of California. http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm
4. Berners-Lee, T., Fielding, R. and H. Frystyk, “Hypertext Transfer Protocol – HTTP/1.0”, RFC 1945, May 1996.
5. Fielding, Gettys, Mogul, Frystyk, Masinter, Leach, Berners-Lee (1999). HTTP – Hypertext Transport Protocol, W3C RFC2616. ftp://ftp.isi.edu/in-notes/rfc2616.txt