On convergence rate for Erlang-Sevastyanov type models with infinitely many servers (In memory and to the 90th anniversary of A.D. Solovyev (06.09.1927--06.04.2001))
A. Yu. VeretennikovTheory of Stochastic Processes
Vol.22 (38), no.1, 2017, pp.89-103
Polynomial convergence rate to stationarity is shown for extended Erlang-Sevastyanov's model with variable intensities of service and arrivals.