Benyuan Liu Daniel R. Figueiredo Yang Guo James F. Kurose Donald F. Towsley A Study of Networks Simulation Efficiency: Fluid Simulation vs. Packet-level Simulation. 1244-1253 2001 INFOCOM http://www.ieee-infocom.org/2001/paper/239.ps db/conf/infocom/infocom2001-3.html#LiuFGKT01