1. B. Braden, D. Clark, S. Shenker, Integrated services in the Internet architecture: an overview, RFC1633.
2. S. Blake, D.L. Black, M.A. Carlson, E. Davies, Z. Wang, W. Weiss, An architecture for differentiated services, RFC2475.
3. J. Babiarz, X.-G. Liu, K.H. Chan, M. Menth, Three state PCN marking, Nov. 2007. .
4. B. Briscoe, D. Songhurst, P. Eardley, V. Liatsos, F.L. Faucheur, A. Charny, K.H. Chan, S. Dudley, G. Karagiannis, A. Báder, L. Westberg, Pre-congestion notification marking, Oct. 2006. .
5. A. Charny, J. Zhang, F.L. Faucheur, V. Liatsos, Pre-congestion notification using single marking for admission and termination, Nov. 2007. .