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2. A glossary of World Wide Web Terminology, http://www-personal.umich.edu/~zoe/Glossary.html
3. W3C World Wide Web Consortium, http://www.w3.org
4. Graham, S.: HTML Sourcebook, A Complete Guide to HTML 3.0. John Wiley & Sons, Inc., Chichester (1996)
5. HTTP Proxy Server 1.0, http://www.reitshamer.com/source/httpproxy.html