@misc{indiciae641ddaaf18ca,
  title = {Homogeneous Contact Transformations.},
  author = {L P Eisenhart},
  year = {1950},
  doi = {10.1073/pnas.36.1.25},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588942/},
  note = {Source identifier: 16588942}
}