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3. Ash, G.R., Chemouil, P.: 20 years of dynamic routing in telephone networks: looking backward to the future, IEEE Global Communications Newsletter, pp. 1–4, October 2004, note: appears as insert in the October 2005 issue of IEEE Communications Magazine
4. Ash, G.R., Chen, J.S., Frey, A.E., Huang, B.D.: Real time network routing in a dynamic class-of-service network. In: Proceedings of 13th international teletraffic congress (ITC13), pp. 187–194, Copenhagen, Denmark (1991)
5. Braun, H.-W.: Models of policy based routing, IETF RFC 1104, June 1989. http://www.rfc-editor.org/rfc/rfc1104.txt