@article{manna1991multifractality,
  title={Multifractality of space-filling bearings and Apollonian packings},
  author={Manna, SS and Vicsek, T},
  journal={Journal of statistical physics},
  volume={64},
  number={3-4},
  pages={525--539},
  year={1991},
  publisher={Kluwer Academic Publishers-Plenum Publishers}
}