@article{GirNew02,
  author = {Girvan, M. and Newman, M. E. J.},
  interhash = {ecd7a48a37f660ab421472140168c892},
  intrahash = {ec20851eb4909dd27cefec2dc9883fa4},
  journal = {PNAS},
  month = {June},
  number = 12,
  pages = {7821-7826},
  title = {Community structure in social and biological networks},
  volume = 99,
  year = 2002
}