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[1] Tim O'Reilly, "What Is Web 2.0", http://www.oreillynet.com/pub/a/oreilly/tim/news/2005/09/30/what-is-web-20.html, Sep. 2005.
[2] "Web 2.0", http://en.wikipedia.org/wiki/Web_2
[3] Costa, "Creating a weblog in 15 minutes", http://www.rubyonrails.org/screencasts, July. 2006.
[4] "Writing your first Django app, part 1", http://www.djangoproject.com/documentation/tutorial1
[5] "Design philosophies", http://www.djangoproject.com/documentation/design_philosophies/
[6] "Model reference", http://www.djangoproject.com/documentation/model_api/
[7] "Database API reference", http://www.djangoproject.com/documentation/db_api/#retrieving-objects
[8] http://code.djangoproject.com/browser/django/trunk/django/db/models/query.py
[9] "Or lookups", http://www.djangoproject.com/documentation/models/or_lookups/
[10]
[11] "A Relational Model of Data for Large Shared Data Banks", E. F. Codd , Communications of the ACM, Vol. 13, No. 6, June 1970, pp. 377-387.
[12] "Database Management System", http://en.wikipedia.org/wiki/Database_management_system
[13] "SQL", http://en.wikipedia.org/wiki/SQL
