References and bibliography
===========================

.. [OPSK] OpenStack, [Online]. Available at https://www.openstack.org/
.. [ENFV] ETSI NFV, [Online]. Available at
          http://www.etsi.org/technologies-clusters/technologies/nfv
.. [vE-CPE] ETSI NFV Use Cases, [Online]. Available at
          http://www.etsi.org/deliver/etsi_gs/nfv/001_099/001/01.01.01_60/gs_nfv001v010101p.pdf
.. [security] IETF, [Online]. Available at
          https://tools.ietf.org/html/draft-ietf-nvo3-security-requirements-06

.. [firewall] OpenStack FW, [Online]. Available at
          http://docs.openstack.org/juno/config-reference/content/firewalls-default-ports.html


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