1. Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers. IETF RFC 2474, December 1998.
2. An Expedited Forwarding PHB. IETF RFC 2598, June 1999.
3. Assured Forwarding PHB Group. IETF RFC 2597, February 1999.
4. Recommendation on Queue Management and Congestion Avoidance in the Internet. IETF RFC 2309, April 1998
5. Transmission Control Protocol, RFC 793, September 1981