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Network feedback in a congestion-control system is subject to delay, which can significantly affect stability and performance of the entire system. While most existing stability conditions explicitly depend on delay Di of individual flow i, a recent study  shows that the combination of a symmetric Jacobian A and condition ρ(A) < 1 guarantees local stability of the system regardless of Di. However, the requirement of symmetry is very conservative and no further results have been obtaineddoi:10.1109/cdc.2006.377630 dblp:conf/cdc/ZhangL06 fatcat:bco3fbkygbaxjppbwo4mhwur64