Torsten Hoefler Timo Schneider Andrew Lumsdaine Multistage switches are not crossbars: Effects of static routing in high-performance networks. 116-125 2008 CLUSTER http://dx.doi.org/10.1109/CLUSTR.2008.4663762 conf/cluster/2008 db/conf/cluster/cluster2008.html#HoeflerSL08