@misc{indiciaeb08dd6af2008,
  title = {Comment on "Einstein equations in vacuum as integrability conditions"},
  author = {KP Tod},
  year = {1985},
  doi = {10.1103/physrevlett.54.1594},
  url = {https://pubmed.ncbi.nlm.nih.gov/10031080/},
  note = {Source identifier: 10031080}
}