Infinitesimal perturbation analysis for queueing networks with general service time distributions.

Bernd Heidergott Infinitesimal perturbation analysis for queueing networks with general service time distributions. 43-58 1999 31 Queueing Syst. 1-2 http://dx.doi.org/10.1023/A:1019193711052 db/journals/questa/questa31.html#Heidergott99