@misc{indiciae0f2f63b5eeb4,
  title = {On Line Congruences.},
  author = {W van der Kulk},
  year = {1948},
  doi = {10.1073/pnas.34.1.9},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588779/},
  note = {Source identifier: 16588779}
}