@misc{indiciaec8fc57805fac,
  title = {No perfect two-state cellular automata for density classification exists.},
  author = {M Land and RK Belew},
  year = {1995},
  doi = {10.1103/physrevlett.74.5148},
  url = {https://pubmed.ncbi.nlm.nih.gov/10058695/},
  note = {Source identifier: 10058695}
}