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http://tools.ietf.org/html/rfc3209
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4. Chiu, A., Choudhury, G., Doverspike, R., & Li, G. (2007). Restoration design in IP over reconfigurable all-optical networks. NPC 2007, Dalian, P.R. China, September 2007.
5. Choudhury, G. (Ed.) (2005). Prioritized Treatment of Specific OSPF Version 2 Packets and Congestion Avoidance. IETF RFC 4222, Oct.