@article{palla2005k,
  title={K-clique percolation and clustering in directed and weighted networks},
  author={Palla, Gergely and {\'A}bel, D{\'a}niel and Der{\'e}nyi, Imre and Farkas, Ill{\'e}s and Pollner, P{\'e}ter and Vicsek, Tam{\'a}s},
  journal={Bolayai Society Mathematical Studies},
  year={2005}
}