@misc{indiciae66ad1715f8ec,
  title = {An Ergodic Theorem for n-Parameter Groups.},
  author = {N Dunford},
  year = {1939},
  doi = {10.1073/pnas.25.4.195},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588285/},
  note = {Source identifier: 16588285}
}