Diffusion approximations for open multiclass queueing networks: sufficient conditions involving state space collapse.

Ruth J. Williams Diffusion approximations for open multiclass queueing networks: sufficient conditions involving state space collapse. 27-88 1998 30 Queueing Syst. 1-2 http://dx.doi.org/10.1023/A:1019108819713 db/journals/questa/questa30.html#Williams98a