@article{vicsek1981random,
  title={Random walks on bond percolation clusters: ac hopping conductivity below the threshold},
  author={Vicsek, T},
  journal={Zeitschrift f{\"u}r Physik B Condensed Matter},
  volume={45},
  number={2},
  pages={153--157},
  year={1981},
  publisher={Springer-Verlag}
}