Predrag R. Jelenkovic Avishai Mandelbaum Petar Momcilovic Heavy Traffic Limits for Queues with Many Deterministic Servers. 53-69 2004 47 Queueing Syst. 1-2 http://dx.doi.org/10.1023/B:QUES.0000032800.52494.51 db/journals/questa/questa47.html#JelenkovicMM04