@Article{noKey,
  author = {Heidtmann, Klaus},
  title  = {Internet-Graphen},
  journal = {Informatik-Spektrum},
  year   = {2013},
  number = {5},
  url    = {http://dx.doi.org/10.1007/s00287-012-0654-z},
  doi = {10.1007/s00287-012-0654-z},
  const  = {\ text}
}