@misc{indiciae74783bcaa4fd,
  title = {Note on a Metrically Transitive System.},
  author = {W Seidel},
  year = {1933},
  doi = {10.1073/pnas.19.4.453},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577539/},
  note = {Source identifier: 16577539}
}