@misc{indiciaee7e1cf0a338c,
  title = {A Conformal Wave Equation.},
  author = {O Veblen},
  year = {1935},
  doi = {10.1073/pnas.21.7.484},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588007/},
  note = {Source identifier: 16588007}
}