@misc{indiciae9731097d0d6d,
  title = {TRANSFORMATION GROUPS WITH TWO CLASSES OF ORBITS.},
  author = {A Borel},
  year = {1957},
  doi = {10.1073/pnas.43.11.983},
  url = {https://pubmed.ncbi.nlm.nih.gov/16590125/},
  note = {Source identifier: 16590125}
}