@misc{indiciae205cbf65941c,
  title = {DIFFERENTIABLE MAPPINGS IN THE SCHOENFLIES PROBLEM.},
  author = {M Morse},
  year = {1958},
  doi = {10.1073/pnas.44.10.1068},
  url = {https://pubmed.ncbi.nlm.nih.gov/16590309/},
  note = {Source identifier: 16590309}
}