@misc{indiciaef158a1be8988,
  title = {Ratchet cellular automata.},
  author = {M B Hastings and C J Olson Reichhardt and C Reichhardt},
  year = {2003},
  doi = {10.1103/physrevlett.90.247004},
  url = {https://pubmed.ncbi.nlm.nih.gov/12857218/},
  note = {Source identifier: 12857218}
}