@misc{indiciaeb5ff49b12636,
  title = {Geometry of Two-Component Spinors.},
  author = {O Veblen},
  year = {1933},
  doi = {10.1073/pnas.19.4.462},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577541/},
  note = {Source identifier: 16577541}
}