@misc{indiciaeb347e0330ddb,
  title = {Generalized Riemann Spaces.},
  author = {L P Eisenhart},
  year = {1951},
  doi = {10.1073/pnas.37.5.311},
  url = {https://pubmed.ncbi.nlm.nih.gov/16589011/},
  note = {Source identifier: 16589011}
}