@misc{indiciaeda319e135bb6,
  title = {An Ergodic Theorem.},
  author = {P R Halmos},
  year = {1946},
  doi = {10.1073/pnas.32.5.156},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588730/},
  note = {Source identifier: 16588730}
}