@misc{indiciaeb6dece55d53d,
  title = {Continuous Transformations of Manifolds.},
  author = {S Lefschetz},
  year = {1925},
  doi = {10.1073/pnas.11.6.290},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587002/},
  note = {Source identifier: 16587002}
}