@misc{indiciaeeaeb6b550ebf,
  title = {CLUSTER SETS OF ARBITRARY FUNCTIONS.},
  author = {E F Collingwood},
  year = {1960},
  doi = {10.1073/pnas.46.9.1236},
  url = {https://pubmed.ncbi.nlm.nih.gov/16590740/},
  note = {Source identifier: 16590740}
}