Ogbimi, E.F. & Oluwatope, Ayodeji & Aderounmu, Ganiyu. (2010). Developing a Feedback Model for Managing Congestion in Packet Switched Wide Area Networks. 10.1007/978-90-481-9151-2_101. The objectives of the paper was to design a feedback model for congestion control in packet switched WAN and carry out the
performance evaluation of the model. A feedback approach was generated by designing a feedback model. Control theory was used
to assess the stability of thebandwidth. The stability of flow of bandwidth was determined by finding the transfer function of the routers. A fluid flow 
model was developed using a queuing model. Secondly, the flow of bandwidth was optimized and the stability was checked. The
conditions for stability in a packet switched WAN were established.