@misc{indiciaeed77b5a25867,
  title = {Algorithmically unsolvable problems for a cell automaton.},
  author = {W R Stahl},
  year = {1965},
  doi = {10.1016/0022-5193(65)90017-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/5875309/},
  note = {Source identifier: 5875309}
}