@misc{indiciaedc1026a162a7,
  title = {Geometry of Four-Component Spinors.},
  author = {O Veblen},
  year = {1933},
  doi = {10.1073/pnas.19.5.503},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587777/},
  note = {Source identifier: 16587777}
}