@article{MehlerGleimGaitschetal.2020,
  author    = {Alexander Mehler and R{\"u}diger Gleim and Regina Gaitsch and Wahed Hemati and Tolga Uslu},
  title     = {From topic networks to distributed cognitive maps: Zipfian topic universes in the area of volunteered geographic information},
  journal   = {Complexity},
  volume    = {2020},
  number    = {Article ID 4607025},
  doi       = {10.1155/2020/4607025},
  year      = {2020},
}