@misc{indiciae54c75e5fbbea,
  title = {Tensor Analysis Without Coördinates.},
  author = {G Y Rainich},
  year = {1923},
  doi = {10.1073/pnas.9.6.179},
  url = {https://pubmed.ncbi.nlm.nih.gov/16576694/},
  note = {Source identifier: 16576694}
}