Predrag R. Jelenkovic Petar Momcilovic Bert Zwart Reduced Load Equivalence under Subexponentiality. 97-112 2004 46 Queueing Syst. 1-2 http://dx.doi.org/10.1023/B:QUES.0000021143.87779.3f db/journals/questa/questa46.html#JelenkovicMZ04