@misc{indiciaef384acb349ab,
  title = {Generalized Riemann Spaces and General Relativity.},
  author = {L P Eisenhart},
  year = {1953},
  doi = {10.1073/pnas.39.6.546},
  url = {https://pubmed.ncbi.nlm.nih.gov/16589302/},
  note = {Source identifier: 16589302}
}