@article{ZhouZemanovaZamoraetal.2006,
  author    = {Changsong Zhou and Lucia Zemanova and Gorka Zamora and Claus C. Hilgetag and J{\"u}rgen Kurths},
  title     = {Hierarchical organization unveiled by functional connectivity in complex brain networks},
  journal   = {Physical review letters},
  volume    = {97},
  doi       = {10.1103/PhysRevLett.97.238103},
  year      = {2006},
}