@Article{PhysRevLett.100.118703,
  author = {Leicht, E. A. and Newman, M. E. J.},
  title  = {Community Structure in Directed Networks},
  journal = {Phys. Rev. Lett.},
  year   = {2008},
  number = {11},
  url    = {http://prl.aps.org/abstract/PRL/v100/i11/e118703},
  doi = {10.1103/PhysRevLett.100.118703},
  const  = {\ text}
}