@misc{indiciaeb51478c3a429,
  title = {Projective Differentiation in Spinors.},
  author = {O Veblen and A H Taub},
  year = {1934},
  doi = {10.1073/pnas.20.1.85},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587847/},
  note = {Source identifier: 16587847}
}