@misc{indiciaec5ad68079271,
  title = {Sphere-Spaces.},
  author = {H Whitney},
  year = {1935},
  doi = {10.1073/pnas.21.7.464},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588001/},
  note = {Source identifier: 16588001}
}