@misc{indiciae14ede7a4cbe2,
  title = {Quasi-closed sets and fixed points.},
  author = {G T Whyburn},
  year = {1967},
  doi = {10.1073/pnas.57.2.201},
  url = {https://pubmed.ncbi.nlm.nih.gov/16591452/},
  note = {Source identifier: 16591452}
}