Randeep Bhatia Nicole Immorlica Tracy Kimbrel Vahab S. Mirrokni Joseph Naor Baruch Schieber Traffic Engineering of Management Flows by Link Augmentations on Confluent Trees. 2-26 2008 42 Theory Comput. Syst. 1 http://dx.doi.org/10.1007/s00224-007-9010-0 db/journals/mst/mst42.html#BhatiaIKMNS08