Arenas, A.Díaz-Guilera, A.Guimerà, R.2004-12-272004-12-2720012001http://hdl.handle.net/2003/1936810.17877/DE290R-2106enThe American Physical SocietyPhysical Review Letters530Communication in Networks with Hierarchical Branching10.1103/PhysRevLett.86.3196article (journal)