References
Cisco,. (2005). Creating Business Value and Operational Excellence with the Cisco Systems Lifecycle Services Approach. [Web]. Retrieved from http://www.cisco.com/warp/public/437/services/lifecycle/LifecycleServicesWhitePaper.pdf
Cisco,. (2011). IP NGN Delivery Services Model. [Web]. Retrieved from http://www.cisco.com/global/EMEA/IPNGN/ppdioo_method.html
Cisco,.(2011). Cisco Services for Carrier Ethernet. [Web]. Retrieved from http://www.cisco.com/en/US/services/ps2961/ps5868/CE_Services_Overview_EXTERNAL_121208.pdf