@misc{indiciae328ba933d9f1,
  title = {ABSTRACT HOMOTOPY. III.},
  author = {D M Kan},
  year = {1956},
  doi = {10.1073/pnas.42.7.419},
  url = {https://pubmed.ncbi.nlm.nih.gov/16589880/},
  note = {Source identifier: 16589880}
}