@misc{indiciaeede00e2854b1,
  title = {Continuous Transformations of Manifolds.},
  author = {S Lefschetz},
  year = {1923},
  doi = {10.1073/pnas.9.3.90},
  url = {https://pubmed.ncbi.nlm.nih.gov/16576673/},
  note = {Source identifier: 16576673}
}