@misc{indiciae0e6c0b0650c8,
  title = {A Question in General Relativity.},
  author = {L I Schiff},
  year = {1939},
  doi = {10.1073/pnas.25.7.391},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577922/},
  note = {Source identifier: 16577922}
}