@misc{indiciae807a553abc1e,
  title = {A geometric identity for Pappus' theorem.},
  author = {M Hawrylycz},
  year = {1994},
  doi = {10.1073/pnas.91.8.2909},
  url = {https://pubmed.ncbi.nlm.nih.gov/11607470/},
  note = {Source identifier: 11607470}
}