@misc{indiciae7ad61dee878e,
  title = {Separable Quadratic Differential Forms and Einstein Solutions.},
  author = {E Kasner},
  year = {1925},
  doi = {10.1073/pnas.11.1.95},
  url = {https://pubmed.ncbi.nlm.nih.gov/16586981/},
  note = {Source identifier: 16586981}
}