@article{tibely2012ontologies,
  title={Ontologies and tag-statistics},
  author={Tib{\'e}ly, Gergely and Pollner, P{\'e}ter and Vicsek, Tam{\'a}s and Palla, Gergely},
  journal={New Journal of Physics},
  volume={14},
  number={5},
  pages={053009},
  year={2012},
  publisher={IOP Publishing}
}