Sem C. Borst Rudesindo Núñez-Queija Bert Zwart Sojourn time asymptotics in processor-sharing queues. 31-51 2006 53 Queueing Syst. 1-2 http://dx.doi.org/10.1007/s11134-006-7585-9 db/journals/questa/questa53.html#BorstNZ06